Bump react from 16.6.3 to 16.7.0

[dependabot-preview]

Bumps react from 16.6.3 to 16.7.0.

Release notes

Sourced from react's releases.

v16.7.0

React DOM

• Fix performance of React.lazy for large numbers of lazily-loaded components. ([acdlite](http://github.com/acdlite) in #14429)
• Clear fields on unmount to avoid memory leaks. ([trueadm](http://github.com/trueadm) in #14276)
• Fix bug with SSR and context when mixing react-dom/server@16.6 and react@<16.6. ([gaearon](http://github.com/gaearon) in #14291)
• Fix a performance regression in profiling mode. ([bvaughn](http://github.com/bvaughn) in #14383)

Scheduler (Experimental)

• Post to MessageChannel instead of window. ([acdlite](http://github.com/acdlite) in #14234)
• Reduce serialization overhead. ([developit](http://github.com/developit) in #14249)
• Fix fallback to setTimeout in testing environments. ([bvaughn](http://github.com/bvaughn) in #14358)
• Add methods for debugging. ([mrkev](http://github.com/mrkev) in #14053)

Changelog

Sourced from react's changelog.

16.7.0 (December 19, 2018)

React DOM

• Fix performance of React.lazy for large numbers of lazily-loaded components. ([acdlite](http://github.com/acdlite) in #14429)
• Clear fields on unmount to avoid memory leaks. ([trueadm](http://github.com/trueadm) in #14276)
• Fix bug with SSR and context when mixing react-dom/server@16.6 and react@<16.6. ([gaearon](http://github.com/gaearon) in #14291)
• Fix a performance regression in profiling mode. ([bvaughn](http://github.com/bvaughn) in #14383)

Scheduler (Experimental)

• Post to MessageChannel instead of window. ([acdlite](http://github.com/acdlite) in #14234)
• Reduce serialization overhead. ([developit](http://github.com/developit) in #14249)
• Fix fallback to setTimeout in testing environments. ([bvaughn](http://github.com/bvaughn) in #14358)
• Add methods for debugging. ([mrkev](http://github.com/mrkev) in #14053)

Commits

• 4a10721 Memoize promise listeners to prevent exponential growth (#14429)
• 535804f Removed Fabric-specific feature flag files and updated Rollup to use the (non...
• 2743fb7 Enable hooks by default for FB React Native renderer (#14435)
• 7325ebe Inject overrideProps() fn to DevTools (#14427)
• a22880e Add support for Suspense & lazy() to the react-is package (#14423)
• 947bddd Remove redundant argument of getPlugins function (#14419)
• ce43a8c Updated version incrementing suggestion in release script based on team discu...
• f64906f Dangerfile exits early if build failed (#14400)
• 8df4d59 Implement pauseExecution, continueExecution, dumpQueue for Scheduler (#14053)
• 5bb4ad7 Added ErrorBoundary tests for useEffect and useLayoutEffect (#14401)
• Additional commits viewable in compare view

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