Bump coverage from 7.0.2 to 7.0.4 (#92)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.0.2 to 7.0.4.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.0.2...7.0.4)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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