Update readme.md

Author: a-maurice

docs/readme.md

@@ -76,6 +76,7 @@ Release Notes
     - General: Update to Firebase C++ SDK version 12.3.0.
     - General (Android): Update to Firebase Android BoM version 33.3.0.
     - General (iOS): Update to Firebase Cocoapods version 11.2.0.
+    - General: Update to EDM4U version 1.2.183.
     - Messaging (Android): Fixed issue with TokenReceived not being called
       when the application has a cached token from a previous run.
       https://github.com/firebase/quickstart-unity/issues/1088.