Bump karma-coverage from 2.1.1 to 2.2.0

Bumps [karma-coverage](https://github.com/karma-runner/karma-coverage) from 2.1.1 to 2.2.0.
- [Release notes](https://github.com/karma-runner/karma-coverage/releases)
- [Changelog](https://github.com/karma-runner/karma-coverage/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma-coverage/compare/v2.1.1...v2.2.0

)

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

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