Add notarize.com to USERS.md
Add notarize.com to USERS.md

Summary::raised_hands: :tada:

Uses Relay on the web app used by notaries; consumer web launching soon™.
Closes https://github.com/facebook/relay/pull/925

Differential Revision: D3026504

Pulled By: wincent

fb-gh-sync-id: 1599acbae3b5d5726d58b3c11d1a0317faae504c
shipit-source-id: 1599acbae3b5d5726d58b3c11d1a0317faae504c

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