Version 8.3.0
### 8.3.0:
- Changes
- Firestore: Simplified the API for modifying the settings of a
`FirebaseFirestore` instance. This is a backwards-incompatible change and
requires updates to code that sets `FirebaseFirestore.Settings`.
- Firestore: Changed an argument to `Query.WhereNotIn()` from `List` to
`IEnumerable`, to be consistent with `Query.WhereIn()`.
- Messaging (Android): Fixes an issue with receiving tokens when
initializing the app.