Backport changelog updates from past few android releases
# Unreleased
+
+# 20.1.0
- [changed] SSL and gRPC initialization now happens on a separate thread, which
reduces the time taken to produce the first query result.
-- [fixed] Updated gRPC to 1.21.0. A bug in the prior version would occasionally
- cause a crash if a network state change occurred concurrently with an RPC.
- (#428)
- [feature] Added `clearPersistence()`, which clears the persistent storage
including pending writes and cached documents. This is intended to help
write reliable tests (https://github.com/firebase/firebase-js-sdk/issues/449).
+# 20.0.0
+- [changed] Migrated from the Android Support Libraries to the Jetpack
+ (AndroidX) Libraries.
+
+# 19.0.2
+- [fixed] Updated gRPC to 1.21.0. A bug in the prior version would occasionally
+ cause a crash if a network state change occurred concurrently with an RPC.
+ (#428)
# 19.0.1
- [fixed] Fixed an issue that prevented schema migrations for clients with
