Upgrade mocha to version 5.1.1

[depfu]

We've upgraded a dependency and got test failures.

name	version specification	new version
mocha	^2.2.5	5.1.1

It looks like this version isn't compatible with your project right now. Please take a look at the exact failure to figure out if this is something you need to work on.

What changed?

✳️ mocha ( → 5.1.1) · Repo · Changelog

Release Notes

From the Github release:

5.1.1 / 2018-04-18

🐛 Fixes

• #3325: Revert change which broke --watch (@boneskull)

Commits

See the full diff on Github. The new version differs by 6 commits:

• Release v5.1.1
• update package-lock.json [ci skip]
• update CHANGELOG.md for v5.1.1 [ci skip]
• Revert "remove default js in "--watch-extensions" option; closes #3275"
• update outdated info in docs/README.md [ci skip]
• fix ESLint problems and consolidate configuration

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[papandreou]

The test failure seems to be due to this change that landed between mocha 5.0.1 and 5.0.2.

[alexjeffburke]

@depfu rebase

[depfu]

Closed in favor of #48.

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