Update pytest to 3.7.3

[pyup-bot]

This PR updates pytest from 3.7.1 to 3.7.3.

Changelog

3.7.2

=========================

Bug Fixes
---------

- `3671 <https://github.com/pytest-dev/pytest/issues/3671>`_: Fix ``filterwarnings`` not being registered as a builtin mark.


- `3768 <https://github.com/pytest-dev/pytest/issues/3768>`_, `3789 <https://github.com/pytest-dev/pytest/issues/3789>`_: Fix test collection from packages mixed with normal directories.


- `3771 <https://github.com/pytest-dev/pytest/issues/3771>`_: Fix infinite recursion during collection if a ``pytest_ignore_collect`` hook returns ``False`` instead of ``None``.


- `3774 <https://github.com/pytest-dev/pytest/issues/3774>`_: Fix bug where decorated fixtures would lose functionality (for example ``mock.patch``).


- `3775 <https://github.com/pytest-dev/pytest/issues/3775>`_: Fix bug where importing modules or other objects with prefix ``pytest_`` prefix would raise a ``PluginValidationError``.


- `3788 <https://github.com/pytest-dev/pytest/issues/3788>`_: Fix ``AttributeError`` during teardown of ``TestCase`` subclasses which raise an exception during ``__init__``.


- `3804 <https://github.com/pytest-dev/pytest/issues/3804>`_: Fix traceback reporting for exceptions with ``__cause__`` cycles.



Improved Documentation
----------------------

- `3746 <https://github.com/pytest-dev/pytest/issues/3746>`_: Add documentation for ``metafunc.config`` that had been mistakenly hidden.

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://pyup.io/changelogs/pytest/
• Homepage: http://pytest.org

[coveralls]

Pull Request Test Coverage Report for Build 583

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 88.707%

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Totals
Change from base Build 547:	0.09%
Covered Lines:	2388
Relevant Lines:	2692

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #80