Version 9.2.0
### 9.2.0
- Changes
- Crashlytics: Fix requiring user code to reference Crashlytics when using il2cpp.
- Firestore: Added `TransactionOptions` to control how many times a
transaction will retry commits before failing
([#318](https://github.com/firebase/firebase-unity-sdk/pull/318)).
- Database (Desktop): If the app data directory doesn't exist, create it.
This fixes an issue with disk persistence on Linux.
- Messaging (Android): Make sure all the resources are closed in
`RegistrationIntentService`.
([#973](https://github.com/firebase/firebase-cpp-sdk/issues/973)).