Update karma to the latest version 🚀

[greenkeeper]

The devDependency karma was updated from 4.1.0 to 4.2.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: karmarunnerbot
License: MIT

Release Notes for v4.2.0

Bug Fixes

• logging: Util inspect for logging the config. (#3332) (70b72a9)
• reporter: format stack with 1-based column (#3325) (182c04d), closes #3324
• server: Add error handler for webserver socket. (#3300) (fe9a1dd)

Commits

The new version differs by 13 commits.

• 42933c9 chore: release v4.2.0
• db1ea57 chore: update contributors
• a1049c6 chore: update eslint packages to latest and fix complaints (#3312)
• 70b72a9 fix(logging): Util inspect for logging the config. (#3332)
• 1087926 fix typo: (#3334)
• 182c04d fix(reporter): format stack with 1-based column (#3325)
• f0c4677 docs(travis): Correct the docs to also show how to do it on Xenial (#3316)
• 3aea7ec chore(deps): update core-js -> ^3.1.3 (#3321)
• 5e11340 chore: revert back to Mocha 4 (#3313)
• 1205bce chore(test): fix flaky test cases (#3314)
• 7f40349 Cleanup dependencies (#3309)
• 7828bea chore: update braces and chokidar to latest versions (#3307)
• fe9a1dd fix(server): Add error handler for webserver socket. (#3300)

See the full diff

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