CHANGES.md in ruby-upwork-oauth2-2.1.4 vs CHANGES.md in ruby-upwork-oauth2-2.2.0

@@ -1,6 +1,9 @@
 # Release History
 
+## 2.2.0
+* Support Client Credentials Grant
+
 ## 2.1.4
 * Add GraphQL support
 
 ## 2.1.3
 * Send Message to a Batch of Rooms API