change log changes.

Author: kedarchandrayan

CHANGELOG.md

@@ -1,7 +1,8 @@
 [OST JAVA SDK v2.2.0](https://github.com/ostdotcom/ost-sdk-java/tree/v2.2.0)
 ---
 
-* Added Webhooks module to V2 API's
+* Added webhooks module to call webhook management OST APIs
+* Support for verify webhook signature
 
 [OST JAVA SDK v2.1.0](https://github.com/ostdotcom/ost-sdk-java/tree/v2.1.0)
 ---