fix(deps): update dependency rxdart_ext to ^0.3.0 (#73)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

example/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
     sdk: flutter
   cupertino_icons: ^1.0.4
   flutter_provider: ^2.1.0
-  rxdart_ext: ^0.2.1
+  rxdart_ext: ^0.3.0
   rx_shared_preferences:
 
 dependency_overrides: