Update dependency mocha to v8.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	8.2.0 -> 8.2.1

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Release Notes

mochajs/mocha

### [`v8.2.1`](https://togithub.com/mochajs/mocha/blob/master/CHANGELOG.md#​821--2020-11-02) [Compare Source](https://togithub.com/mochajs/mocha/compare/v8.2.0...v8.2.1) Fixed stuff. #### :bug: Fixes - [#​4489](https://togithub.com/mochajs/mocha/issues/4489): Fix problematic handling of otherwise-unhandled `Promise` rejections and erroneous "`done()` called twice" errors ([**@​boneskull**](https://togithub.com/boneskull)) - [#​4496](https://togithub.com/mochajs/mocha/issues/4496): Avoid `MaxListenersExceededWarning` in watch mode ([**@​boneskull**](https://togithub.com/boneskull)) Also thanks to [**@​akeating**](https://togithub.com/akeating) for a documentation fix!

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