Update marshmallow to 2.18.0

[pyup-bot]

This PR updates marshmallow from 2.14.0 to 2.18.0.

Changelog

2.18.0

+++++++++++++++++++

Features:

- Add warnings for functions in ``marshmallow.utils`` that are removed in
marshmallow 3.

Bug fixes:

- Copying ``missing`` with ``copy.copy`` or ``copy.deepcopy`` will not
duplicate it (:pr:`1099`).

2.17.0

+++++++++++++++++++

Features:

- Add ``marshmallow.__version_info__`` (:pr:`1074`).
- Add warnings for API that is deprecated or changed to help users
prepare for marshmallow 3 (:pr:`1075`).

2.16.3

+++++++++++++++++++

Bug fixes:

- Prevent memory leak when dynamically creating classes with ``type()``
(:issue:`732`). Thanks :user:`asmodehn` for writing the tests to
reproduce this issue.

2.16.2

+++++++++++++++++++

Bug fixes:

- Prevent warning about importing from ``collections`` on Python 3.7
(:issue:`1027`). Thanks :user:`nkonin` for reporting and
:user:`jmargeta` for the PR.

2.16.1

+++++++++++++++++++

Bug fixes:

- Remove spurious warning about implicit collection handling
(:issue:`998`). Thanks :user:`lalvarezguillen` for reporting.

2.16.0

+++++++++++++++++++

Bug fixes:

- Allow username without password in basic auth part of the url in
``fields.Url`` (:pr:`982`). Thanks user:`alefnula` for the PR.

Other changes:

- Drop support for Python 3.3 (:pr:`987`).

2.15.6

+++++++++++++++++++

Bug fixes:

- Prevent ``TypeError`` when a non-collection is passed to a ``Schema`` with ``many=True``.
Instead, raise ``ValidationError`` with ``{'_schema': ['Invalid input type.']}`` (:issue:`906`).
- Fix ``root`` attribute for nested container fields on list
on inheriting schemas (:issue:`956`). Thanks :user:`bmcbu`
for reporting.

These fixes were backported from 3.0.0b15 and 3.0.0b16.

2.15.5

+++++++++++++++++++

Bug fixes:

- Handle empty SQLAlchemy lazy lists gracefully when dumping (:issue:`948`).
Thanks :user:`vke-code` for the catch and :user:`YuriHeupa` for the patch.

2.15.4

+++++++++++++++++++

Bug fixes:

- Respect ``load_from`` when reporting errors for ``validates('field_name')``
(:issue:`748`). Thanks :user:`m-novikov` for the catch and patch.

2.15.3

+++++++++++++++++++

Bug fixes:

- Fix passing ``only`` as a string to ``nested`` when the passed field
defines ``dump_to`` (:issue:`800`, :issue:`822`). Thanks
:user:`deckar01` for the catch and patch.

2.15.2

+++++++++++++++++++

Bug fixes:

- Fix a race condition in validation when concurrent threads use the
same ``Schema`` instance (:issue:`783`). Thanks :user:`yupeng0921` and
:user:`lafrech` for the fix.
- Fix serialization behavior of
``fields.List(fields.Integer(as_string=True))`` (:issue:`788`). Thanks
:user:`cactus` for reporting and :user:`lafrech` for the fix.
- Fix behavior of ``exclude`` parameter when passed from parent to
nested schemas (:issue:`728`). Thanks :user:`timc13` for reporting and
:user:`deckar01` for the fix.

2.15.1

+++++++++++++++++++

Bug fixes:

- :cve:`CVE-2018-17175`: Fix behavior when an empty list is passed as the ``only`` argument
(:issue:`772`). Thanks :user:`deckar01` for reporting and thanks
:user:`lafrech` for the fix.

2.15.0

+++++++++++++++++++

Bug fixes:

- Handle ``UnicodeDecodeError`` when deserializing ``bytes`` with a
``String`` field (:issue:`650`). Thanks :user:`dan-blanchard` for the
suggestion and thanks :user:`4lissonsilveira` for the PR.

Links

• PyPI: https://pypi.org/project/marshmallow
• Changelog: https://pyup.io/changelogs/marshmallow/
• Repo: https://github.com/marshmallow-code/marshmallow