• Updated API docs for the UriAndroidNotificationSound class to further clarify that developers may need to write code that makes use of platform channels
• [Android] fix issue 881 where recurring notifications may fail to schedule the next occurrence on older Android versions as the ThreeTen Android Backport library hadn't been initialised yet
• [Android] switched implementation of createNotificationChannelGroup and deleteNotificationChannelGroup methods to use the NotificationManager APIs instead of the NotificationManagerCompat APIs. If you had issues with 3.0.1 then this should fix the issue (e.g. as reported in issue 871) as the the APIs that were previously being called would've required apps to use more recent versions of the AndroidX libraries