add interface def for unstable_batchedUpdates in 'react-dom'
add interface def for unstable_batchedUpdates in 'react-dom'

Summary:Tells Flow what this unstable React DOM function means so it won't complain.
Closes https://github.com/facebook/flow/pull/1510

Reviewed By: samwgoldman

Differential Revision: D3119707

Pulled By: gabelevi

fb-gh-sync-id: 5976e417c2d4f2ab335efb4d82dad12bff3ab672
fbshipit-source-id: 5976e417c2d4f2ab335efb4d82dad12bff3ab672

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