Update mocha to version 2.5.3 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

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 🌴

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The new version differs by 63 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 63 commits in total. See the full diff.

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[coveralls]

Coverage remained the same at 100.0% when pulling 588a307 on greenkeeper-mocha-2.5.3 into 9ac1063 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling d7f42c1 on greenkeeper-mocha-2.5.3 into 99d4c02 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 33279ac on greenkeeper-mocha-2.5.3 into 506410d on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 550a05a on greenkeeper-mocha-2.5.3 into 0afa436 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling a4fd338 on greenkeeper-mocha-2.5.3 into 834e749 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 746aaaa on greenkeeper-mocha-2.5.3 into da8411b on master.