v4.5.0

• Updated tested JS API version to 4.13.0.

  • Deprecated downloadURL and downloadURLs.

• Require at least Dart SDK 2.0.0-dev.36.

Firestore

• Moved setLogLevel to a top-level method from Firestore.
  Not considering this a breaking change since the method never worked as
  previously exposed.

• Added isEqual to CollectionReference, DocumentSnapshot,
  SnapshotMetadataand QuerySnapshot.

• Added disableNetwork and enableNetwork to Firestore