build: add .bazelversion file for Bazelisk (#3771)
build: add .bazelversion file for Bazelisk (#3771)


kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe,kythe/kythe