Remove "To be released" from CHANGELOG
- [fixed] Fixed an issue that prevented schema migrations for clients with
large offline datasets (#370).
-# To be released - 19.0.0
+# 19.0.0
- [feature] You can now query across all collections in your database with a
given collection ID using the `FirebaseFirestore.collectionGroup()` method.
- [changed] The garbage collection process for on-disk persistence that
