Bumping version to 3.4.0

This version includes the Android 13 push prompt feature. The iOS and Android native versions are already up to date

Author: emawby

pubspec.yaml

@@ -1,6 +1,6 @@
 name: onesignal_flutter
 description: OneSignal is a free push notification service for mobile apps. This plugin makes it easy to integrate your flutter app with OneSignal
-version: 3.3.2
+version: 3.4.0
 author: Brad Hesse <brad@onesignal.com>, Josh Kasten <josh@onesignal.com>
 homepage: https://github.com/OneSignal/OneSignal-Flutter-SDK