Update dependency mocha to v6.2.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	6.2.1 -> 6.2.2

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Release Notes

mochajs/mocha

### [`v6.2.2`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​622--2019-10-18) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.2.1...v6.2.2) #### :bug: Fixes - [#​4025](https://togithub.com/mochajs/mocha/issues/4025): Fix duplicate `EVENT_RUN_END` events upon uncaught exception ([**@​juergba**](https://togithub.com/juergba)) - [#​4051](https://togithub.com/mochajs/mocha/issues/4051): Fix "unhide" function in `html` reporter (browser) ([**@​pec9399**](https://togithub.com/pec9399)) - [#​4063](https://togithub.com/mochajs/mocha/issues/4063): Fix use of [esm](https://npm.im/esm) in Node.js v8.x ([**@​boneskull**](https://togithub.com/boneskull)) - [#​4033](https://togithub.com/mochajs/mocha/issues/4033): Fix output when multiple async exceptions are thrown ([**@​juergba**](https://togithub.com/juergba)) #### :book: Documentation - [#​4046](https://togithub.com/mochajs/mocha/issues/4046): Site accessibility fixes ([**@​Mia-jeong**](https://togithub.com/Mia-jeong)) - [#​4026](https://togithub.com/mochajs/mocha/issues/4026): Update docs for custom reporters in browser ([**@​Lindsay-Needs-Sleep**](https://togithub.com/Lindsay-Needs-Sleep)) - [#​3971](https://togithub.com/mochajs/mocha/issues/3971): Adopt new OpenJS Foundation Code of Conduct ([**@​craigtaub**](https://togithub.com/craigtaub))

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