Update readme.md

Author: a-maurice

docs/readme.md

@@ -71,8 +71,12 @@ Support
 
 Release Notes
 -------------
-### Upcoming release
+### 12.2.0
 - Changes
+    - General: Update to Firebase C++ SDK version 12.2.0.
+    - General (Android): Update to Firebase Android BoM version 33.1.2.
+    - General (iOS): Update to Firebase Cocoapods version 11.0.0.
+    - General: Update to EDM4U version 1.2.182.
     - Messaging: Deprecated the Dispose functions, as they are no longer
       necessary for cleaning up memory.