Bump react from 16.7.0 to 16.8.0

[dependabot-preview]

Bumps react from 16.7.0 to 16.8.0.

Release notes

Sourced from react's releases.

v16.8.0

React

• Add Hooks — a way to use state and other React features without writing a class. ([acdlite](https://github.com/acdlite) et al. in #13968)
• Improve the useReducer Hook lazy initialization API. ([acdlite](https://github.com/acdlite) in #14723)

React DOM

• Bail out of rendering on identical values for useState and useReducer Hooks. ([acdlite](https://github.com/acdlite) in #14569)
• Use Object.is algorithm for comparing useState and useReducer values. ([Jessidhia](https://github.com/Jessidhia) in #14752)
• Don’t compare the first argument passed to useEffect/useMemo/useCallback Hooks. ([acdlite](https://github.com/acdlite) in #14594)
• Support synchronous thenables passed to React.lazy(). ([gaearon](https://github.com/gaearon) in #14626)
• Render components with Hooks twice in Strict Mode (DEV-only) to match class behavior. ([gaearon](https://github.com/gaearon) in #14654)
• Warn about mismatching Hook order in development. ([threepointone](https://github.com/threepointone) in #14585 and [acdlite](https://github.com/acdlite) in #14591)
• Effect clean-up functions must return either undefined or a function. All other values, including null, are not allowed. [acdlite](https://github.com/acdlite) in #14119

React Test Renderer and Test Utils

• Support Hooks in the shallow renderer. ([trueadm](https://github.com/trueadm) in #14567)
• Fix wrong state in shouldComponentUpdate in the presence of getDerivedStateFromProps for Shallow Renderer. ([chenesan](https://github.com/chenesan) in #14613)
• Add ReactTestRenderer.act() and ReactTestUtils.act() for batching updates so that tests more closely match real behavior. ([threepointone](https://github.com/threepointone) in #14744)

ESLint Plugin: React Hooks

• Initial release. ([calebmer](https://github.com/calebmer) in #13968)
• Fix reporting after encountering a loop. ([calebmer](https://github.com/calebmer) and [Yurickh](https://github.com/Yurickh) in #14661)
• Don't consider throwing to be a rule violation. ([sophiebits](https://github.com/sophiebits) in #14040)

Changelog

Sourced from react's changelog.

16.8.0 (February 6, 2019)

React

• Add Hooks — a way to use state and other React features without writing a class. ([acdlite](https://github.com/acdlite) et al. in #13968)
• Improve the useReducer Hook lazy initialization API. ([acdlite](https://github.com/acdlite) in #14723)

React DOM

• Bail out of rendering on identical values for useState and useReducer Hooks. ([acdlite](https://github.com/acdlite) in #14569)
• Use Object.is algorithm for comparing useState and useReducer values. ([Jessidhia](https://github.com/Jessidhia) in #14752)
• Don’t compare the first argument passed to useEffect/useMemo/useCallback Hooks. ([acdlite](https://github.com/acdlite) in #14594)
• Support synchronous thenables passed to React.lazy(). ([gaearon](https://github.com/gaearon) in #14626)
• Render components with Hooks twice in Strict Mode (DEV-only) to match class behavior. ([gaearon](https://github.com/gaearon) in #14654)
• Warn about mismatching Hook order in development. ([threepointone](https://github.com/threepointone) in #14585 and [acdlite](https://github.com/acdlite) in #14591)
• Effect clean-up functions must return either undefined or a function. All other values, including null, are not allowed. [acdlite](https://github.com/acdlite) in #14119

React Test Renderer and Test Utils

• Support Hooks in the shallow renderer. ([trueadm](https://github.com/trueadm) in #14567)
• Fix wrong state in shouldComponentUpdate in the presence of getDerivedStateFromProps for Shallow Renderer. ([chenesan](https://github.com/chenesan) in #14613)
• Add ReactTestRenderer.act() and ReactTestUtils.act() for batching updates so that tests more closely match real behavior. ([threepointone](https://github.com/threepointone) in #14744)

ESLint Plugin: React Hooks

• Initial release. ([calebmer](https://github.com/calebmer) in #13968)
• Fix reporting after encountering a loop. ([calebmer](https://github.com/calebmer) and [Yurickh](https://github.com/Yurickh) in #14661)
• Don't consider throwing to be a rule violation. ([sophiebits](https://github.com/sophiebits) in #14040)

Commits

• d1326f4 [TestUtils.act] fix return result checking (#14758)
• 267ed98 expose TestUtils.act() for batching actions in tests (#14744)
• fb3f7bf Avoid importing Scheduler directly (#14757)
• 81470a0 Add missing 16.6.1 changelog entry
• e602b52 Use SameValue instead of === to check for dispatchAction equivalence (#14752)
• e489c3f Update the version with Hooks proposal in README (#14751)
• c21c41e Tweak invalid Hook warning and error (#14747)
• fec00a8 Typo in comment (#14739)
• 66eb293 Restrict effect return type to a function or nothing (#14119)
• 51c0791 Warn when second argument is passed to useCallback (#14729)
• Additional commits viewable in compare view

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