fix(deps): update react monorepo to v16.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
react	dependencies	minor	16.7.0 -> 16.8.0	homepage, source
react-dom	dependencies	minor	16.7.0 -> 16.8.0	homepage, source

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Release Notes

facebook/react

v16.8.0

Compare Source

React

• Add Hooks — a way to use state and other React features without writing a class. (@​acdlite et al. in #​13968)
• Improve the useReducer Hook lazy initialization API. (@​acdlite in #​14723)

React DOM

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

React Test Renderer and Test Utils

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

ESLint Plugin: React Hooks

• Initial release. (@​calebmer in #​13968)
• Fix reporting after encountering a loop. (@​calebmer and @​Yurickh in #​14661)
• Don't consider throwing to be a rule violation. (@​sophiebits in #​14040)

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