chore(deps): update dependency react-dom to v16.8.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
react-dom	dependencies	patch	16.8.5 -> 16.8.6	homepage, source

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Release Notes

facebook/react

### [`v16.8.6`](https://togithub.com/facebook/react/blob/master/CHANGELOG.md#​1686-March-27-2019) [Compare Source](https://togithub.com/facebook/react/compare/v16.8.5...v16.8.6) ##### React DOM - Fix an incorrect bailout in `useReducer()`. ([@​acdlite](https://togithub.com/acdlite) in [#​15124](https://togithub.com/facebook/react/pull/15124)) - Fix iframe warnings in Safari DevTools. ([@​renanvalentin](https://togithub.com/renanvalentin) in [#​15099](https://togithub.com/facebook/react/pull/15099)) - Warn if `contextType` is set to `Context.Consumer` instead of `Context`. ([@​aweary](https://togithub.com/aweary) in [#​14831](https://togithub.com/facebook/react/pull/14831)) - Warn if `contextType` is set to invalid values. ([@​gaearon](https://togithub.com/gaearon) in [#​15142](https://togithub.com/facebook/react/pull/15142))

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