Update pytest-mypy to 0.4.0

[pyup-bot]

This PR updates pytest-mypy from 0.3.2 to 0.4.0.

Changelog

0.4.0

* Run mypy once per session instead of once per file.
* Stop passing --incremental (which mypy now defaults to).
* Support configuring the plugin in a conftest.py.
* Add support for Python 3.8

See [the milestone](https://github.com/dbader/pytest-mypy/milestone/6) for details.

0.3.3

* Register `mypy` marker.
* Add a PEP-518 [build-system]
* Add dependency pins for Python 3.4.
* Add support for Python 3.7

See [the milestone](https://github.com/dbader/pytest-mypy/milestone/3) for details.

Links

• PyPI: https://pypi.org/project/pytest-mypy
• Changelog: https://pyup.io/changelogs/pytest-mypy/
• Repo: https://github.com/dbader/pytest-mypy

[codecov-io]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #73   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines           9      9           
=====================================
  Hits            9      9

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[pyup-bot]

Closing this in favor of #75