typescript: use new flag for entrystream (#3247)
typescript: use new flag for entrystream (#3247)

entrystream now warns when you pass --read_json, so change to
the new flag.
kythe/kythe,kythe/kythe,bzz/kythe,bzz/kythe,bzz/kythe,bzz/kythe,kythe/kythe,kythe/kythe,kythe/kythe,bzz/kythe,kythe/kythe,kythe/kythe,bzz/kythe,kythe/kythe,bzz/kythe,kythe/kythe,bzz/kythe,bzz/kythe,kythe/kythe,bzz/kythe,kythe/kythe,bzz/kythe,bzz/kythe