title: Firebase notification won`t sound or vibrate flutter
body: <p>So I have enabled firebase messaging on my futter app everything works fine but, when I receive the notification in my app it wont sound or vibrate, neither android or ios. I believe FCM does it by default, I also have "IosNotificationSettings(sound: true, badge: true, alert: true)", but the notification just come mute. Do you guys have any Idea what could be happening? I searched for this situation but couldnt find anything about it. Thanks in advance for your help.</p>
  
  <pre><code>class _HomeScreenState extends State&lt;HomeScreen&gt;
  with SingleTickerProviderStateMixin {
  
   String _homeScreenText = "Waiting for token...";
  
   final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  
   static const String contato = "contato";
  
   TabController _tabController;
  
   @override
   void initState() {
      _tabController = new TabController(length: 5, vsync: this);
      super.initState();
  
      _firebaseMessaging.configure(
         onMessage: (Map&lt;String, dynamic&gt; message) {
           print('on message $message');
         },
         onResume: (Map&lt;String, dynamic&gt; message) {
           print('on resume $message');
         },    
         onLaunch: (Map&lt;String, dynamic&gt; message) {
         print('on launch $message');
         },
        );
  
       _firebaseMessaging.requestNotificationPermissions(
           const IosNotificationSettings(sound: true, badge: true, alert: true));
       _firebaseMessaging.onIosSettingsRegistered
         .listen((IosNotificationSettings settings) {
           print("Settings registered: $settings");
        });
       _firebaseMessaging.getToken().then((String token) {
         assert(token != null);
         setState(() {
       _homeScreenText = "Push Messaging token: $token";
       });
       print(_homeScreenText);
       });
  
       _firebaseMessaging.getToken().then((token) {
       Firestore.instance.collection("pushtokens").document().setData({"devtoken": token});
       });
      }
  </code></pre>