chore(deps): update dependency mocha to v6.1.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
mocha	devDependencies	patch	6.1.2 -> 6.1.4	homepage, source

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Release Notes

mochajs/mocha

### [`v6.1.4`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​614--2019-04-18) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.1.3...v6.1.4) #### :lock: Security Fixes - [#​3877](https://togithub.com/mochajs/mocha/issues/3877): Upgrade [js-yaml](https://npm.im/js-yaml), addressing [code injection vulnerability](https://www.npmjs.com/advisories/813) ([**@​bjornstar**](https://togithub.com/bjornstar)) ### [`v6.1.3`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​613--2019-04-11) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.1.2...v6.1.3) #### :bug: Fixes - [#​3863](https://togithub.com/mochajs/mocha/issues/3863): Fix `yargs`-related global scope pollution ([**@​inukshuk**](https://togithub.com/inukshuk)) - [#​3869](https://togithub.com/mochajs/mocha/issues/3869): Fix failure when installed w/ `pnpm` ([**@​boneskull**](https://togithub.com/boneskull))

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