Update pytest to 4.6.0

[pyup-bot]

This PR updates pytest from 4.5.0 to 4.6.0.

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]

Pull Request Test Coverage Report for Build 123

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 117:	0.0%
Covered Lines:	356
Relevant Lines:	356

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 123

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 117:	0.0%
Covered Lines:	356
Relevant Lines:	356

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💛 - Coveralls