Update WHO-IS-USING.md

Author: idelvall

WHO-IS-USING.md

@@ -1,6 +1,6 @@
 # Who is using `json-forms`?
 
-> Send a pull request with your project at the bottom
+> Are you using `json-forms`? Then end a pull request with your project at the bottom!
 
 - **[Brutusin-RPC](http://demo.rpc.brutusin.org/rpc/repo/#http-services/rpc.http.schema)**: `json-forms` had been originally created for automatically generating test UIs for `Brutusin-RPC` services.
 - *Your project here*