Update pytest-flake8 to 1.1.0

[pyup-bot]

This PR updates pytest-flake8 from 1.0.7 to 1.1.0.

Changelog

1.1.0

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- Drop Python 2 support and dependency on py; from erikkemperman
- Drop support for Python 3.5, 3.6
- Stop testing on Python versions prior to 3.7
- Add a `flake8-max-doc-length` option; from rodrigomologni
- Fix some minor typos; from kianmeng

Links

• PyPI: https://pypi.org/project/pytest-flake8
• Changelog: https://pyup.io/changelogs/pytest-flake8/
• Repo: https://github.com/tholo/pytest-flake8

[coveralls]

Coverage remained the same at 90.265% when pulling fd3c1dc on pyup-update-pytest-flake8-1.0.7-to-1.1.0 into 0187b7a on develop.