chore(deps): update dependency mocha to v6.1.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
mocha	devDependencies	patch	6.1.1 -> 6.1.2	homepage, source

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Release Notes

mochajs/mocha

### [`v6.1.2`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​612--2019-04-08) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.1.1...v6.1.2) #### :bug: Fixes - [#​3867](https://togithub.com/mochajs/mocha/issues/3867): Re-publish v6.1.1 from POSIX OS to avoid dropped executable flags ([**@​boneskull**](https://togithub.com/boneskull))

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