startListening

Starts listening the changes of state of permissions.

Ideally it automatically starts listening eagerly when application is started and created via dev.shreyaspatil.permissionFlow.initializer.PermissionFlowInitializer. If initializer is disabled, then starts listening lazily when getPermissionEvent or getMultiplePermissionState method is used for the first time. But this can be used to start to listen again after stopping listening with stopListening.