build(deps-dev): bump @stryker-mutator/mocha-runner from 5.6.0 to 5.6.1 (#1663)

Bumps [@stryker-mutator/mocha-runner](https://github.com/stryker-mutator/stryker-js/tree/HEAD/packages/mocha-runner) from 5.6.0 to 5.6.1.
- [Release notes](https://github.com/stryker-mutator/stryker-js/releases)
- [Changelog](https://github.com/stryker-mutator/stryker-js/blob/master/packages/mocha-runner/CHANGELOG.md)
- [Commits](https://github.com/stryker-mutator/stryker-js/commits/v5.6.1/packages/mocha-runner)

---
updated-dependencies:
- dependency-name: "@stryker-mutator/mocha-runner"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]