Declare a dependency on scheduler

[gaearon]

ReactNativeRenderer has require('scheduler') in it but we don't seem to declare a dependency. As a result, the latest sync broke useEffect in open source master:

function Counter() {
  const [count, setCount] = useState(0);
  useEffect(() => {
    const id = setInterval(() => {
      setCount(c => c + 1);
    }, 1000)
    return () => clearInterval(id);
  }, [])
  return <View><Text>{count}</Text></View>
}

This adds an explicit dependency on the same version we're currently using internally.

[pull-bot]

	Warnings
⚠️	🔒 package.json - Changes were made to package.json. This will require a manual import by a Facebook employee.

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Generated by 🚫 dangerJS against 3863de7

[facebook-github-bot]

@hramos is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @gaearon in 6001acb.

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