Update mocha to version 2.5.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

mocha just published its new version 2.5.3, 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 154 commits .

• e939d8e Release v2.5.3
• 52dcc3f Rebuild mocha.js
• 7496c14 Update CHANGELOG.md for v2.5.3 [ci skip]
• 9e93efc Make HTML reporter failure/passed links preventDefault to avoid SPA's hash navigation (#2119)
• 6d24063 Fix HTML reporter regression causing duplicate error output (#2112)
• 08cb423 avoid BitBucket rate-limiting when installing PhantomJS
• fdbbe40 Release v2.5.2
• c094f20 Rebuild mocha.js
• 7c134ea Update CHANGELOG.md for v2.5.2 [ci skip]
• 25f9378 Add .envrc to .gitignore
• 49b5ff1 Avoid double and triple xUnit XML escaping (#2178)
• 015b809 Release v2.5.1
• 3ef083e update CHANGELOG.md [ci skip]
• bd9450b to-iso-string must be a dependency
• 30e917b Release v2.5.0

There are 154 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:}

[coveralls]

Coverage remained the same at 81.86% when pulling bc131e3eca0727143325a40a0e3b73440cba5285 on greenkeeper-mocha-2.5.3 into ff9f21d84985fd5c4a873c5e5457db0629d2a503 on master.