Update pytest to 5.1.1

[pyup-bot]

This PR updates pytest from 5.1.0 to 5.1.1.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://pyup.io/changelogs/pytest/
• Homepage: https://docs.pytest.org/en/latest/

[coveralls]

Coverage remained the same at 83.514% when pulling c836c80 on pyup-update-pytest-5.1.0-to-5.1.1 into 0c1a6c1 on master.

[coveralls]

Coverage remained the same at 83.514% when pulling c836c80 on pyup-update-pytest-5.1.0-to-5.1.1 into 0c1a6c1 on master.

[coveralls]

Coverage remained the same at 83.514% when pulling c836c80 on pyup-update-pytest-5.1.0-to-5.1.1 into 0c1a6c1 on master.