Boris Kamenov

Added support for notification channels so sound, lights and vibratio…

1

…n can be supported on devices running Android 8 Oreo and later. Added functions: FirebasePlugin.createChannel FirebasePlugin.deleteChannel FirebasePlugin.listChannels API.md updated with full description of the new methods. Functionality tested on Android...

Adding support for Android API 31+ Added PendingIntent.FLAG_IMMUTABLE.