Summary:
[Buck](https://buckbuild.com) has a concept of a versioned tool. In order to
properly use RN with Buck, the `cli.js` script should return the proper version
when passed `--version`.
Reviewed By: astreet
Differential Revision: D3197207
fb-gh-sync-id: 12ea35587cf492eb89d7dd102e93bdd26bc813c0
fbshipit-source-id: 12ea35587cf492eb89d7dd102e93bdd26bc813c0