Update dependency mocha to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mocha (source, changelog)	2.7.1 -> 3.0.1

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Release Notes

freerange/mocha (mocha)

v3.0.1

Compare Source

v3.0.0

Compare Source

v2.8.2

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v2.8.1

Compare Source

v2.8.0

Compare Source

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Configuration

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[coveralls]

Pull Request Test Coverage Report for Build 20436078274

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.944%

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Totals
Change from base Build 20436022768:	0.0%
Covered Lines:	1191
Relevant Lines:	1216

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💛 - Coveralls