Update mocha to version 2.4.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

mocha just published its new version 2.4.3, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of mocha – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

---

The new version differs by 74 commits (ahead by 74, behind by 1).

• 608415d Release v2.4.3
• a4345ef stub chalk in browser, closes #2078
• 753a511 Release v2.4.2
• 8aafbb5 rebuild
• 337e863 update CHANGELOG; add link to CHANGELOG in README.md
• f87395c Merge pull request #2074 from gyandeeps/master
• d8ffcfb Fix: reporters with chalk functions (fixes #2073)
• eef307d Merge pull request #2072 from thedark1337/master
• 9f3774f Fix #2071: Removed color code to fix Chalk colors
• a661e6c Merge pull request #2053 from mislav/window-vs-global
• aa550e1 Release v2.4.1
• 33b7261 rebuild mocha.js
• 761fa17 rename HISTORY.md => CHANGELOG.md
• 623c9b6 increase retry test timeout
• f00c197 Merge pull request #2068 from danielstjules/dstjules/test-body

There are 74 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io. It keeps your software, up to date, all the time.

_{Tired of seeing this sponsor message? Upgrade to the supporter plan! You'll also get your pull requests faster :zap:}