Add poetry config, remove unnecessary files

.flake8

@@ -1,3 +1,8 @@
 [flake8]
 max-line-length = 120
-exclude = tests/fixtures/*
+exclude =
+  .git,
+  __pycache__,
+  .venv,
+  build
+  tests/fixtures/*

flake8_django/__init__.py

@@ -1 +1 @@
-from flake8_django.checker import DjangoStyleChecker
+from flake8_django.checker import DjangoStyleChecker  # noqa: F401

flake8_django/checkers/model_content_order.py

@@ -1,4 +1,4 @@
-from ast import Assign, Call, ClassDef, FunctionDef
+from ast import Assign, ClassDef, FunctionDef
 from functools import partial
 
 from .base_model_checker import BaseModelChecker

pyproject.toml

@@ -0,0 +1,36 @@
+[tool.poetry]
+name = "flake8-django"
+version = "1.1.1"
+license = "GPL-3.0-or-later"
+description = "Plugin to catch bad style specific to Django Projects."
+authors = ["Rocio Aramberri Schegel <[email protected]>"]
+readme = "README.md"
+keywords = ["flake8", "django", "lint"]
+repository = "https://github.com/rocioar/flake8-django"
+classifiers=[
+    "Framework :: Flake8",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.5",
+    "Programming Language :: Python :: 3.6",
+    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "Topic :: Software Development :: Quality Assurance",
+]
+
+[tool.poetry.plugins]
+[tool.poetry.plugins."flake8.extension"]
+DJ0 = "flake8_django:DjangoStyleChecker"
+
+[build-system]
+requires = ["poetry_core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.dependencies]
+python = "^3.6"
+flake8 = "^3.8.4"
+
+[tool.poetry.dev-dependencies]
+pytest = "6.2.2"