[1.3.1+1] Bump Dart SDK version [1.3.1] Added a keepAlive flag to AsyncBuilder [1.3.0] Migrated to null safety [1.2.1] Added retain flag to AsyncBuilder [1.2.0] Implemented InitBuilder Bug fixes [1.1.0] Added example Bug fixes Updated rxdart version constraints [1.0.0] - Initial release. Implemented AsyncBuilder