update readme (#647)

Author: cynthiajoan

docs/readme.md

@@ -69,6 +69,11 @@ Support
 
 Release Notes
 -------------
+### 10.6.0
+- Changes
+    - General (Android): Update to Firebase Android BoM version 31.2.3.
+    - General (iOS): Update to Firebase Cocoapods version 10.6.0.
+
 ### 10.5.0
 - Changes
     - General (Android): Update to Firebase Android BoM version 31.2.1.