Update dependency mocha to v2.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mocha (source, changelog)	'2.6.0' -> '2.6.1'

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Release Notes

freerange/mocha (mocha)

v2.6.1

Compare Source

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Configuration

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[yegor256]

@rultor please, try to merge, since 4 checks have passed

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 Done! FYI, the full log is here (took me 8min).