v3.4.0

Mocha is now moving to a quicker release schedule: when non-breaking changes are merged, a release should happen that week.

This week's highlights:

• allowUncaught added to commandline as --allow-uncaught (and bugfixed)
• warning-related Node flags

🎉 Enhancements

• #2793, #2697: add --allowUncaught to Node.js (@lrowe)
• #2733: Add --no-warnings and --trace-warnings flags (@sonicdoe)

🐛 Fixes

• #2793, #2697: fix broken allowUncaught (@lrowe)

🔩 Other

• #2778: Add license report and scan status (@xizhao)
• #2794: no special case for macOS running Karma locally (@boneskull)
• #2795: reverts use of semistandard directly ([#2648]) (@boneskull)