10.1.1 release notes (#536)

Update to the release notes for release v10.1.1.

Author: DellaBitta

docs/readme.md

@@ -67,6 +67,12 @@ Support
 
 Release Notes
 -------------
+### 10.1.1
+- Changes
+    - General (Android): Update to Firebase Android BoM version 31.0.3.
+    - Crashlytics (Android): Fixed an [issue](https://github.com/firebase/firebase-android-sdk/issues/4313)
+      preventing native crashes from being reported for Android API 29+.
+
 ### 10.1.0
 - Changes
     - General: Update to Firebase C++ SDK version 10.1.0.