CHANGES.md in twilio-ruby-4.11.1 vs CHANGES.md in twilio-ruby-4.12.1

@@ -1,7 +1,14 @@
 twilio-ruby changelog
 =====================
 
+Version 4.12.0
+--------------
+
+Released September 1, 2016:
+
+- Add voice grant.
+
 Version 4.11.1
 -------------
 
 Released February 12, 2016: