Add Zzish to USERS.md
Summary:
Hi!
We've been happily using relay at zzish.com for a while (since March last year) and we'd like to be listed on Users.
Thanks!
Closes
@@ -63,3 +63,7 @@ Using Relay in your production app? If you'd like to add your team to the list,
- [ThoughtMachine](https://thoughtmachine.net/)
- [Twitter](https://fabric.io/blog/building-fabric-mission-control-with-graphql-and-relay)
- [Two-N](http://two-n.com/)
+
+## Z
+
+- [Zzish](https://zzish.com/)
