Update coverage to 4.5.3

[pyup-bot]

This PR updates coverage from 4.5.1 to 4.5.3.

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

Links

• PyPI: https://pypi.org/project/coverage
• Changelog: https://pyup.io/changelogs/coverage/
• Repo: https://github.com/nedbat/coveragepy

[coveralls]

Coverage remained the same at 100.0% when pulling fc5e25f on pyup-update-coverage-4.5.1-to-4.5.3 into ea4ce24 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling fc5e25f on pyup-update-coverage-4.5.1-to-4.5.3 into ea4ce24 on master.

[pyup-bot]

Closing this in favor of #232