Update CHANGELOG

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Support `Configuration.defaultRealmPath` for setting a custom default path for realms. ([#665](https://github.com/realm/realm-dart/pull/665))
 * Support `Configuration.defaultStoragePath ` for getting the platform specific storage paths. ([#665](https://github.com/realm/realm-dart/pull/665))
 * Support `App.deleteUser ` for deleting user accounts. ([#679](https://github.com/realm/realm-dart/pull/679))
+* Support Apple, Facebook and Google authentication. ([#740](https://github.com/realm/realm-dart/pull/740))
 
 ### Internal
 * Added a command to `realm_dart` for deleting Atlas App Services applications. Usage: `dart run realm_dart delete-apps`. By default it will delete apps from `http://localhost:9090` which is the endpoint of the local docker image. If `--atlas-cluster` is provided, it will authenticate, delete the application from the provided cluster. (PR [#663](https://github.com/realm/realm-dart/pull/663))