Fix array lookup to .includes rather than .has (#867)
Fix array lookup to .includes rather than .has (#867)


tonygentilcore/draft-js,johnmpotter/draft-js,facebook/draft-js,TripleDip/draft-js,johnmpotter/draft-js,dirkholsopple/draft-js,tonygentilcore/draft-js,dirkholsopple/draft-js,TripleDip/draft-js