Add a changelog entry for "Stop persisting last acknowledged batch ID"
- [feature] DocumentSnapshot.get() now supports retrieving fields as
custom objects (POJOs) by passing a Class<T> instance, e.g.
`snapshot.get("field", CustomType.class)`.
+- [fixed] Fixed a crash that could happen when the app is shut down after
+ a write has been sent to the server but before it has been received on
+ a listener.
# 17.1.5
- [changed] Firestore now recovers more quickly from bad network states.
