CHANGES.md in twilio-ruby-5.2.0 vs CHANGES.md in twilio-ruby-5.2.1

@@ -1,7 +1,16 @@
 twilio-ruby changelog
 =====================
 
+[2017-09-01] Version 5.2.1
+---------------------------
+**Sync**
+- Add support for Streams
+
+**Wireless**
+- Added DataSessions sub-resource to Sims.
+
+
 [2017-08-25] Version 5.2.0
 ---------------------------
 **Library**
 - Add `last_request`, `last_response` properties to http client for easier debugging.
 - Add `Request` class to abstract http client implementations.