Updated Change Log.

Author: NidhiDixit09

ChangeLog.md

@@ -1,7 +1,7 @@
 Branch iOS SDK Change Log
 
 v.3.6.4
-- Added unique id and timestamp to all requests sent to Server.
+- Added 'branch_sdk_request_unique_id' and 'branch_sdk_request_timestamp' to post params of all the SDK requests.
 
 v.3.6.3
 - Fix for duplicate events created from archived request queue on disk.