mocha@2.5.1 breaks build 🚨

[greenkeeperio-bot]

Hello 👋

🚨🚨🚨

mocha just published its new version 2.5.1, which is covered by your current version range. After updating it in your project the build went from success to failure.

This means your software is now malfunctioning, because of this update. Use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 52 commits .

• 015b809 Release v2.5.1
• 3ef083e update CHANGELOG.md [ci skip]
• bd9450b to-iso-string must be a dependency
• 30e917b Release v2.5.0
• 443697f rebuild mocha.js
• 9bfbc9e update CHANGELOG.md, contributors, .mailmap
• 524862b full browserification support; closes #880 (#2271)
• 9e8cbaa try different strategy for avoiding insecure sauce connect
• f8a3d86 trying to fix travis + sauce check for PRs and forks
• 0dde0fa don't run SauceLabs tests on PRs
• 0b1e9b3 add more unit tests for various browsers
• c04c1d7 Make CI run browser tests (#2231)
• b76989c Add --icu-data-dir flag for node (#2248)
• 5e1439d Fix JSDoc (#2219)
• 3904da4 adds node 6 to CI matrix; closes #2239 (#2251)

There are 52 commits in total. See the full diff.

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