Add a Log.e() on fail.

Author: Dallas62

android/src/main/java/com/dieam/reactnativepushnotification/modules/RNPushNotification.java

@@ -129,6 +129,7 @@ public void requestPermissions() {
                   @Override
                   public void onComplete(@NonNull Task<InstanceIdResult> task) {
                       if (!task.isSuccessful()) {
+                          Log.e(LOG_TAG, "exception", task.getException());
                           return;
                       }