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

---

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))

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Enabled.

:recycle: Rebasing: Whenever PR becomes conflicted, or if you modify the PR title to begin with "rebase!".

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot. View repository job log here.