diff --git a/.gitignore b/.gitignore
index e27ffc4..f5acc59 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 dist
 .coverage
 coverage.xml
+htmlcov
diff --git a/poetry.lock b/poetry.lock
index 4573d27..c71e527 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -6,6 +6,15 @@ optional = false
 python-versions = "*"
 version = "1.4.3"
 
+[[package]]
+category = "main"
+description = "Disable App Nap on OS X 10.9"
+marker = "python_version >= \"3.3\" and sys_platform == \"darwin\" or platform_system == \"Darwin\""
+name = "appnope"
+optional = true
+python-versions = "*"
+version = "0.1.0"
+
 [[package]]
 category = "dev"
 description = "Atomic file writes."
@@ -16,7 +25,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.4.0"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Classes Without Boilerplate"
 name = "attrs"
 optional = false
@@ -30,16 +39,25 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Removes unused imports and unused variables"
 name = "autoflake"
-optional = false
+optional = true
 python-versions = "*"
 version = "1.3.1"
 
 [package.dependencies]
 pyflakes = ">=1.1.0"
 
+[[package]]
+category = "main"
+description = "Specifications for callback functions passed in to an API"
+marker = "python_version >= \"3.3\""
+name = "backcall"
+optional = true
+python-versions = "*"
+version = "0.1.0"
+
 [[package]]
 category = "dev"
 description = "The uncompromising code formatter."
@@ -60,6 +78,19 @@ typed-ast = ">=1.4.0"
 [package.extras]
 d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
+[[package]]
+category = "main"
+description = "An easy safelist-based HTML-sanitizing tool."
+name = "bleach"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "3.1.5"
+
+[package.dependencies]
+packaging = "*"
+six = ">=1.9.0"
+webencodings = "*"
+
 [[package]]
 category = "dev"
 description = "Composable command line interface toolkit"
@@ -69,9 +100,9 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "7.1.2"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Cross-platform colored terminal text."
-marker = "sys_platform == \"win32\""
+marker = "python_version >= \"3.3\" and sys_platform == \"win32\" or sys_platform == \"win32\""
 name = "colorama"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
@@ -98,18 +129,34 @@ python-versions = "*"
 version = "0.6"
 
 [[package]]
-category = "dev"
+category = "main"
+description = "Decorators for Humans"
+name = "decorator"
+optional = true
+python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+version = "4.4.2"
+
+[[package]]
+category = "main"
+description = "XML bomb protection for Python stdlib modules"
+name = "defusedxml"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.6.0"
+
+[[package]]
+category = "main"
 description = "Discover and load entry points from installed packages."
 name = "entrypoints"
-optional = false
+optional = true
 python-versions = ">=2.7"
 version = "0.3"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "the modular source code checker: pep8, pyflakes and co"
 name = "flake8"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "3.7.9"
 
@@ -135,6 +182,85 @@ zipp = ">=0.5"
 docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "importlib-resources"]
 
+[[package]]
+category = "main"
+description = "IPython Kernel for Jupyter"
+name = "ipykernel"
+optional = true
+python-versions = ">=3.5"
+version = "5.2.1"
+
+[package.dependencies]
+appnope = "*"
+ipython = ">=5.0.0"
+jupyter-client = "*"
+tornado = ">=4.2"
+traitlets = ">=4.1.0"
+
+[package.extras]
+test = ["pytest (!=5.3.4)", "pytest-cov", "flaky", "nose"]
+
+[[package]]
+category = "main"
+description = "IPython: Productive Interactive Computing"
+name = "ipython"
+optional = true
+python-versions = ">=3.6"
+version = "7.14.0"
+
+[package.dependencies]
+appnope = "*"
+backcall = "*"
+colorama = "*"
+decorator = "*"
+jedi = ">=0.10"
+pexpect = "*"
+pickleshare = "*"
+prompt-toolkit = ">=2.0.0,<3.0.0 || >3.0.0,<3.0.1 || >3.0.1,<3.1.0"
+pygments = "*"
+setuptools = ">=18.5"
+traitlets = ">=4.2"
+
+[package.extras]
+all = ["nose (>=0.10.1)", "Sphinx (>=1.3)", "testpath", "nbformat", "ipywidgets", "qtconsole", "numpy (>=1.14)", "notebook", "ipyparallel", "ipykernel", "pygments", "requests", "nbconvert"]
+doc = ["Sphinx (>=1.3)"]
+kernel = ["ipykernel"]
+nbconvert = ["nbconvert"]
+nbformat = ["nbformat"]
+notebook = ["notebook", "ipywidgets"]
+parallel = ["ipyparallel"]
+qtconsole = ["qtconsole"]
+test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy (>=1.14)"]
+
+[[package]]
+category = "main"
+description = "Vestigial utilities from IPython"
+name = "ipython-genutils"
+optional = true
+python-versions = "*"
+version = "0.2.0"
+
+[[package]]
+category = "main"
+description = "IPython HTML widgets for Jupyter"
+name = "ipywidgets"
+optional = true
+python-versions = "*"
+version = "7.5.1"
+
+[package.dependencies]
+ipykernel = ">=4.5.1"
+nbformat = ">=4.2.0"
+traitlets = ">=4.3.1"
+widgetsnbextension = ">=3.5.0,<3.6.0"
+
+[package.dependencies.ipython]
+python = ">=3.3"
+version = ">=4.0.0"
+
+[package.extras]
+test = ["pytest (>=3.6.0)", "pytest-cov", "mock"]
+
 [[package]]
 category = "dev"
 description = "A Python utility / library to sort Python imports."
@@ -150,13 +276,145 @@ requirements = ["pipreqs", "pip-api"]
 xdg_home = ["appdirs (>=1.4.0)"]
 
 [[package]]
-category = "dev"
+category = "main"
+description = "An autocompletion tool for Python that can be used for text editors."
+marker = "python_version >= \"3.3\""
+name = "jedi"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "0.17.0"
+
+[package.dependencies]
+parso = ">=0.7.0"
+
+[package.extras]
+qa = ["flake8 (3.7.9)"]
+testing = ["colorama", "docopt", "pytest (>=3.9.0,<5.0.0)"]
+
+[[package]]
+category = "main"
+description = "A very fast and expressive template engine."
+name = "jinja2"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.11.2"
+
+[package.dependencies]
+MarkupSafe = ">=0.23"
+
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
+[[package]]
+category = "main"
+description = "An implementation of JSON Schema validation for Python"
+name = "jsonschema"
+optional = true
+python-versions = "*"
+version = "3.2.0"
+
+[package.dependencies]
+attrs = ">=17.4.0"
+pyrsistent = ">=0.14.0"
+setuptools = "*"
+six = ">=1.11.0"
+
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = "*"
+
+[package.extras]
+format = ["idna", "jsonpointer (>1.13)", "rfc3987", "strict-rfc3339", "webcolors"]
+format_nongpl = ["idna", "jsonpointer (>1.13)", "webcolors", "rfc3986-validator (>0.1.0)", "rfc3339-validator"]
+
+[[package]]
+category = "main"
+description = "Jupyter metapackage. Install all the Jupyter components in one go."
+name = "jupyter"
+optional = true
+python-versions = "*"
+version = "1.0.0"
+
+[package.dependencies]
+ipykernel = "*"
+ipywidgets = "*"
+jupyter-console = "*"
+nbconvert = "*"
+notebook = "*"
+qtconsole = "*"
+
+[[package]]
+category = "main"
+description = "Jupyter protocol implementation and client libraries"
+name = "jupyter-client"
+optional = true
+python-versions = ">=3.5"
+version = "6.1.3"
+
+[package.dependencies]
+jupyter-core = ">=4.6.0"
+python-dateutil = ">=2.1"
+pyzmq = ">=13"
+tornado = ">=4.1"
+traitlets = "*"
+
+[package.extras]
+test = ["ipykernel", "ipython", "mock", "pytest"]
+
+[[package]]
+category = "main"
+description = "Jupyter terminal console"
+name = "jupyter-console"
+optional = true
+python-versions = ">=3.5"
+version = "6.1.0"
+
+[package.dependencies]
+ipykernel = "*"
+ipython = "*"
+jupyter-client = "*"
+prompt-toolkit = ">=2.0.0,<3.0.0 || >3.0.0,<3.0.1 || >3.0.1,<3.1.0"
+pygments = "*"
+
+[package.extras]
+test = ["pexpect"]
+
+[[package]]
+category = "main"
+description = "Jupyter core package. A base package on which Jupyter projects rely."
+name = "jupyter-core"
+optional = true
+python-versions = "!=3.0,!=3.1,!=3.2,!=3.3,!=3.4,>=2.7"
+version = "4.6.3"
+
+[package.dependencies]
+pywin32 = ">=1.0"
+traitlets = "*"
+
+[[package]]
+category = "main"
+description = "Safely add untrusted strings to HTML/XML markup."
+name = "markupsafe"
+optional = true
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+version = "1.1.1"
+
+[[package]]
+category = "main"
 description = "McCabe checker, plugin for flake8"
 name = "mccabe"
-optional = false
+optional = true
 python-versions = "*"
 version = "0.6.1"
 
+[[package]]
+category = "main"
+description = "The fastest markdown parser in pure Python"
+name = "mistune"
+optional = true
+python-versions = "*"
+version = "0.8.4"
+
 [[package]]
 category = "dev"
 description = "More routines for operating on iterables, beyond itertools"
@@ -190,7 +448,78 @@ python-versions = "*"
 version = "0.4.3"
 
 [[package]]
-category = "dev"
+category = "main"
+description = "Converting Jupyter Notebooks"
+name = "nbconvert"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "5.6.1"
+
+[package.dependencies]
+bleach = "*"
+defusedxml = "*"
+entrypoints = ">=0.2.2"
+jinja2 = ">=2.4"
+jupyter-core = "*"
+mistune = ">=0.8.1,<2"
+nbformat = ">=4.4"
+pandocfilters = ">=1.4.1"
+pygments = "*"
+testpath = "*"
+traitlets = ">=4.2"
+
+[package.extras]
+all = ["pytest", "pytest-cov", "ipykernel", "jupyter-client (>=5.3.1)", "ipywidgets (>=7)", "pebble", "tornado (>=4.0)", "sphinx (>=1.5.1)", "sphinx-rtd-theme", "nbsphinx (>=0.2.12)", "sphinxcontrib-github-alt", "ipython", "mock"]
+docs = ["sphinx (>=1.5.1)", "sphinx-rtd-theme", "nbsphinx (>=0.2.12)", "sphinxcontrib-github-alt", "ipython", "jupyter-client (>=5.3.1)"]
+execute = ["jupyter-client (>=5.3.1)"]
+serve = ["tornado (>=4.0)"]
+test = ["pytest", "pytest-cov", "ipykernel", "jupyter-client (>=5.3.1)", "ipywidgets (>=7)", "pebble", "mock"]
+
+[[package]]
+category = "main"
+description = "The Jupyter Notebook format"
+name = "nbformat"
+optional = true
+python-versions = ">=3.5"
+version = "5.0.6"
+
+[package.dependencies]
+ipython-genutils = "*"
+jsonschema = ">=2.4,<2.5.0 || >2.5.0"
+jupyter-core = "*"
+traitlets = ">=4.1"
+
+[package.extras]
+test = ["testpath", "pytest", "pytest-cov"]
+
+[[package]]
+category = "main"
+description = "A web-based notebook environment for interactive computing"
+name = "notebook"
+optional = true
+python-versions = ">=3.5"
+version = "6.0.3"
+
+[package.dependencies]
+Send2Trash = "*"
+ipykernel = "*"
+ipython-genutils = "*"
+jinja2 = "*"
+jupyter-client = ">=5.3.4"
+jupyter-core = ">=4.6.1"
+nbconvert = "*"
+nbformat = "*"
+prometheus-client = "*"
+pyzmq = ">=17"
+terminado = ">=0.8.1"
+tornado = ">=5.0"
+traitlets = ">=4.2.1"
+
+[package.extras]
+test = ["nose", "coverage", "requests", "nose-warnings-filters", "nbval", "nose-exclude", "selenium", "pytest", "pytest-cov", "nose-exclude"]
+
+[[package]]
+category = "main"
 description = "Core utilities for Python packages"
 name = "packaging"
 optional = false
@@ -201,6 +530,26 @@ version = "20.3"
 pyparsing = ">=2.0.2"
 six = "*"
 
+[[package]]
+category = "main"
+description = "Utilities for writing pandoc filters in python"
+name = "pandocfilters"
+optional = true
+python-versions = "*"
+version = "1.4.2"
+
+[[package]]
+category = "main"
+description = "A Python Parser"
+marker = "python_version >= \"3.3\""
+name = "parso"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.7.0"
+
+[package.extras]
+testing = ["docopt", "pytest (>=3.0.7)"]
+
 [[package]]
 category = "dev"
 description = "Utility library for gitignore style pattern matching of file paths."
@@ -209,6 +558,27 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "0.8.0"
 
+[[package]]
+category = "main"
+description = "Pexpect allows easy control of interactive console applications."
+marker = "python_version >= \"3.3\" and sys_platform != \"win32\""
+name = "pexpect"
+optional = true
+python-versions = "*"
+version = "4.8.0"
+
+[package.dependencies]
+ptyprocess = ">=0.5"
+
+[[package]]
+category = "main"
+description = "Tiny 'shelve'-like database with concurrency support"
+marker = "python_version >= \"3.3\""
+name = "pickleshare"
+optional = true
+python-versions = "*"
+version = "0.7.5"
+
 [[package]]
 category = "dev"
 description = "plugin and hook calling mechanisms for python"
@@ -225,6 +595,37 @@ version = ">=0.12"
 [package.extras]
 dev = ["pre-commit", "tox"]
 
+[[package]]
+category = "main"
+description = "Python client for the Prometheus monitoring system."
+name = "prometheus-client"
+optional = true
+python-versions = "*"
+version = "0.7.1"
+
+[package.extras]
+twisted = ["twisted"]
+
+[[package]]
+category = "main"
+description = "Library for building powerful interactive command lines in Python"
+name = "prompt-toolkit"
+optional = true
+python-versions = ">=3.6"
+version = "3.0.3"
+
+[package.dependencies]
+wcwidth = "*"
+
+[[package]]
+category = "main"
+description = "Run a subprocess in a pseudo terminal"
+marker = "python_version >= \"3.3\" and sys_platform != \"win32\" or os_name != \"nt\""
+name = "ptyprocess"
+optional = true
+python-versions = "*"
+version = "0.6.0"
+
 [[package]]
 category = "dev"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
@@ -234,10 +635,10 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "1.8.1"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Python style guide checker"
 name = "pycodestyle"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.5.0"
 
@@ -260,21 +661,40 @@ email = ["email-validator (>=1.0.3)"]
 typing_extensions = ["typing-extensions (>=3.7.2)"]
 
 [[package]]
-category = "dev"
+category = "main"
 description = "passive checker of Python programs"
 name = "pyflakes"
-optional = false
+optional = true
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.1.1"
 
 [[package]]
-category = "dev"
+category = "main"
+description = "Pygments is a syntax highlighting package written in Python."
+name = "pygments"
+optional = true
+python-versions = ">=3.5"
+version = "2.6.1"
+
+[[package]]
+category = "main"
 description = "Python parsing module"
 name = "pyparsing"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "2.4.7"
 
+[[package]]
+category = "main"
+description = "Persistent/Functional/Immutable data structures"
+name = "pyrsistent"
+optional = true
+python-versions = "*"
+version = "0.16.0"
+
+[package.dependencies]
+six = "*"
+
 [[package]]
 category = "dev"
 description = "pytest: simple powerful testing with Python"
@@ -316,6 +736,73 @@ pytest = ">=3.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
 
+[[package]]
+category = "main"
+description = "Extensions to the standard Python datetime module"
+name = "python-dateutil"
+optional = true
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+version = "2.8.1"
+
+[package.dependencies]
+six = ">=1.5"
+
+[[package]]
+category = "main"
+description = "Python for Window Extensions"
+marker = "sys_platform == \"win32\""
+name = "pywin32"
+optional = true
+python-versions = "*"
+version = "227"
+
+[[package]]
+category = "main"
+description = "Python bindings for the winpty library"
+marker = "os_name == \"nt\""
+name = "pywinpty"
+optional = true
+python-versions = "*"
+version = "0.5.7"
+
+[[package]]
+category = "main"
+description = "Python bindings for 0MQ"
+name = "pyzmq"
+optional = true
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*"
+version = "19.0.1"
+
+[[package]]
+category = "main"
+description = "Jupyter Qt console"
+name = "qtconsole"
+optional = true
+python-versions = "*"
+version = "4.7.3"
+
+[package.dependencies]
+ipykernel = ">=4.1"
+ipython-genutils = "*"
+jupyter-client = ">=4.1"
+jupyter-core = "*"
+pygments = "*"
+pyzmq = ">=17.1"
+qtpy = "*"
+traitlets = "*"
+
+[package.extras]
+doc = ["Sphinx (>=1.3)"]
+test = ["pytest", "mock"]
+
+[[package]]
+category = "main"
+description = "Provides an abstraction layer on top of the various Qt bindings (PyQt5, PyQt4 and PySide) and additional custom QWidgets."
+name = "qtpy"
+optional = true
+python-versions = "*"
+version = "1.9.0"
+
 [[package]]
 category = "dev"
 description = "Alternative regular expression module, to replace re."
@@ -325,7 +812,15 @@ python-versions = "*"
 version = "2020.4.4"
 
 [[package]]
-category = "dev"
+category = "main"
+description = "Send file to trash natively under Mac OS X, Windows and Linux."
+name = "send2trash"
+optional = true
+python-versions = "*"
+version = "1.5.0"
+
+[[package]]
+category = "main"
 description = "Python 2 and 3 compatibility utilities"
 name = "six"
 optional = false
@@ -364,6 +859,30 @@ version = "0.3"
 mypy = ">=0.720"
 typing-extensions = ">=3.7.4"
 
+[[package]]
+category = "main"
+description = "Terminals served to xterm.js using Tornado websockets"
+name = "terminado"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+version = "0.8.3"
+
+[package.dependencies]
+ptyprocess = "*"
+pywinpty = ">=0.5"
+tornado = ">=4"
+
+[[package]]
+category = "main"
+description = "Test utilities for code working with files and commands"
+name = "testpath"
+optional = true
+python-versions = "*"
+version = "0.4.4"
+
+[package.extras]
+test = ["pathlib2"]
+
 [[package]]
 category = "dev"
 description = "Python Library for Tom's Obvious, Minimal Language"
@@ -372,6 +891,30 @@ optional = false
 python-versions = "*"
 version = "0.10.0"
 
+[[package]]
+category = "main"
+description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
+name = "tornado"
+optional = true
+python-versions = ">= 3.5"
+version = "6.0.4"
+
+[[package]]
+category = "main"
+description = "Traitlets Python config system"
+name = "traitlets"
+optional = true
+python-versions = "*"
+version = "4.3.3"
+
+[package.dependencies]
+decorator = "*"
+ipython-genutils = "*"
+six = "*"
+
+[package.extras]
+test = ["pytest", "mock"]
+
 [[package]]
 category = "dev"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
@@ -389,13 +932,32 @@ python-versions = "*"
 version = "3.7.4.2"
 
 [[package]]
-category = "dev"
+category = "main"
 description = "Measures number of Terminal column cells of wide-character codes"
 name = "wcwidth"
 optional = false
 python-versions = "*"
 version = "0.1.9"
 
+[[package]]
+category = "main"
+description = "Character encoding aliases for legacy web content"
+name = "webencodings"
+optional = true
+python-versions = "*"
+version = "0.5.1"
+
+[[package]]
+category = "main"
+description = "IPython HTML widgets for Jupyter"
+name = "widgetsnbextension"
+optional = true
+python-versions = "*"
+version = "3.5.1"
+
+[package.dependencies]
+notebook = ">=4.4.1"
+
 [[package]]
 category = "main"
 description = "Backport of pathlib-compatible object wrapper for zip files"
@@ -409,8 +971,11 @@ version = "3.1.0"
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
+[extras]
+dev = ["autoflake", "flake8", "jupyter"]
+
 [metadata]
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+content-hash = "bf9620e9d0c124f5a59e84dfee9867b29308baf028dc11116da3e20304fd43d6"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -418,6 +983,10 @@ appdirs = [
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 ]
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@@ -429,10 +998,18 @@ attrs = [
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+    {file = "tornado-6.0.4-cp37-cp37m-win_amd64.whl", hash = "sha256:5618f72e947533832cbc3dec54e1dffc1747a5cb17d1fd91577ed14fa0dc081b"},
+    {file = "tornado-6.0.4-cp38-cp38-win32.whl", hash = "sha256:22aed82c2ea340c3771e3babc5ef220272f6fd06b5108a53b4976d0d722bcd52"},
+    {file = "tornado-6.0.4-cp38-cp38-win_amd64.whl", hash = "sha256:c58d56003daf1b616336781b26d184023ea4af13ae143d9dda65e31e534940b9"},
+    {file = "tornado-6.0.4.tar.gz", hash = "sha256:0fe2d45ba43b00a41cd73f8be321a44936dc1aba233dee979f17a042b83eb6dc"},
+]
+traitlets = [
+    {file = "traitlets-4.3.3-py2.py3-none-any.whl", hash = "sha256:70b4c6a1d9019d7b4f6846832288f86998aa3b9207c6821f3578a6a6a467fe44"},
+    {file = "traitlets-4.3.3.tar.gz", hash = "sha256:d023ee369ddd2763310e4c3eae1ff649689440d4ae59d7485eb4cfbbe3e359f7"},
+]
 typed-ast = [
     {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3"},
     {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb"},
@@ -666,6 +1471,14 @@ wcwidth = [
     {file = "wcwidth-0.1.9-py2.py3-none-any.whl", hash = "sha256:cafe2186b3c009a04067022ce1dcd79cb38d8d65ee4f4791b8888d6599d1bbe1"},
     {file = "wcwidth-0.1.9.tar.gz", hash = "sha256:ee73862862a156bf77ff92b09034fc4825dd3af9cf81bc5b360668d425f3c5f1"},
 ]
+webencodings = [
+    {file = "webencodings-0.5.1-py2.py3-none-any.whl", hash = "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78"},
+    {file = "webencodings-0.5.1.tar.gz", hash = "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"},
+]
+widgetsnbextension = [
+    {file = "widgetsnbextension-3.5.1-py2.py3-none-any.whl", hash = "sha256:bd314f8ceb488571a5ffea6cc5b9fc6cba0adaf88a9d2386b93a489751938bcd"},
+    {file = "widgetsnbextension-3.5.1.tar.gz", hash = "sha256:079f87d87270bce047512400efd70238820751a11d2d8cb137a5a5bdbaf255c7"},
+]
 zipp = [
     {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
     {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
diff --git a/pydantic_sqlalchemy/main.py b/pydantic_sqlalchemy/main.py
index a6c4644..f48173d 100644
--- a/pydantic_sqlalchemy/main.py
+++ b/pydantic_sqlalchemy/main.py
@@ -22,8 +22,8 @@ def sqlalchemy_to_pydantic(
                 name = attr.key
                 if name in exclude:
                     continue
-                default = column.default
-                if default is None and not column.nullable:
+                default = None
+                if column.default is None and not column.nullable:
                     default = ...
                 fields[name] = (python_type, default)
     pydantic_model = create_model(
diff --git a/pyproject.toml b/pyproject.toml
index 9ecc977..ff7ff7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,17 +12,24 @@ sqlalchemy = "^1.3.16"
 pydantic = "^1.5.1"
 importlib-metadata = { version = "^1.6.0", python = "<3.8" }
 
+# Local development dependencies
+jupyter = {version = "^1.0.0", optional = true, extras = ["dev"]}
+autoflake = {version = "^1.3.1", optional = true, extras = ["dev"]}
+flake8 = {version = "^3.7.9", optional = true, extras = ["dev"]}
+
 
 [tool.poetry.dev-dependencies]
 mypy = "^0.770"
 black = "^19.10b0"
 isort = "^4.3.21"
-autoflake = "^1.3.1"
-flake8 = "^3.7.9"
 pytest = "^5.4.1"
 sqlalchemy-stubs = "^0.3"
 pytest-cov = "^2.8.1"
 
+[tool.poetry.extras]
+
+dev = ["autoflake", "flake8", "jupyter"]
+
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"
diff --git a/tests/test_pydantic_sqlalchemy.py b/tests/test_pydantic_sqlalchemy.py
index 45c4513..26fe2e1 100644
--- a/tests/test_pydantic_sqlalchemy.py
+++ b/tests/test_pydantic_sqlalchemy.py
@@ -1,7 +1,8 @@
+from datetime import datetime
 from typing import List
 
 from pydantic_sqlalchemy import sqlalchemy_to_pydantic
-from sqlalchemy import Column, ForeignKey, Integer, String, create_engine
+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String, create_engine
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import Session, relationship, sessionmaker
 
@@ -17,6 +18,7 @@ class User(Base):
     name = Column(String)
     fullname = Column(String)
     nickname = Column(String)
+    updated = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
 
     addresses = relationship(
         "Address", back_populates="user", cascade="all, delete, delete-orphan"
@@ -58,7 +60,10 @@ class PydanticUserWithAddresses(PydanticUser):
     user = db.query(User).first()
     pydantic_user = PydanticUser.from_orm(user)
     data = pydantic_user.dict()
-    assert data == {
+    assert isinstance(data["updated"], datetime)
+    check_data = data.copy()
+    del check_data["updated"]
+    assert check_data == {
         "fullname": "Ed Jones",
         "id": 1,
         "name": "ed",
@@ -66,7 +71,10 @@ class PydanticUserWithAddresses(PydanticUser):
     }
     pydantic_user_with_addresses = PydanticUserWithAddresses.from_orm(user)
     data = pydantic_user_with_addresses.dict()
-    assert data == {
+    assert isinstance(data["updated"], datetime)
+    check_data = data.copy()
+    del check_data["updated"]
+    assert check_data == {
         "fullname": "Ed Jones",
         "id": 1,
         "name": "ed",
@@ -78,6 +86,33 @@ class PydanticUserWithAddresses(PydanticUser):
     }
 
 
+def test_schema() -> None:
+    PydanticUser = sqlalchemy_to_pydantic(User)
+    PydanticAddress = sqlalchemy_to_pydantic(Address)
+    assert PydanticUser.schema() == {
+        "title": "User",
+        "type": "object",
+        "properties": {
+            "id": {"title": "Id", "type": "integer"},
+            "name": {"title": "Name", "type": "string"},
+            "fullname": {"title": "Fullname", "type": "string"},
+            "nickname": {"title": "Nickname", "type": "string"},
+            "updated": {"title": "Updated", "type": "string", "format": "date-time"},
+        },
+        "required": ["id"],
+    }
+    assert PydanticAddress.schema() == {
+        "title": "Address",
+        "type": "object",
+        "properties": {
+            "id": {"title": "Id", "type": "integer"},
+            "email_address": {"title": "Email Address", "type": "string"},
+            "user_id": {"title": "User Id", "type": "integer"},
+        },
+        "required": ["id", "email_address"],
+    }
+
+
 def test_config() -> None:
     class Config:
         orm_mode = True
@@ -98,7 +133,10 @@ class PydanticUserWithAddresses(PydanticUser):
     user = db.query(User).first()
     pydantic_user_with_addresses = PydanticUserWithAddresses.from_orm(user)
     data = pydantic_user_with_addresses.dict(by_alias=True)
-    assert data == {
+    assert isinstance(data["updated"], datetime)
+    check_data = data.copy()
+    del check_data["updated"]
+    assert check_data == {
         "fullname": "Ed Jones",
         "id": 1,
         "name": "ed",
@@ -120,7 +158,10 @@ class PydanticUserWithAddresses(PydanticUser):
     user = db.query(User).first()
     pydantic_user_with_addresses = PydanticUserWithAddresses.from_orm(user)
     data = pydantic_user_with_addresses.dict(by_alias=True)
-    assert data == {
+    assert isinstance(data["updated"], datetime)
+    check_data = data.copy()
+    del check_data["updated"]
+    assert check_data == {
         "fullname": "Ed Jones",
         "id": 1,
         "name": "ed",