title: Can not show notification on real device using react native firebase
body: <p>I have an app that using react native and firebase for push notification. 
  This is my notification that send to client:</p>
  
  <pre><code>   'data' : {
          'title' : ' ' + this.currentUser.email + ' send you a message !',
          'text' : text,
          'senderName' : this.currentUser.email,
          'senderUid': this.currentUser.uid   
      }
  </code></pre>
  
  <p>I use data-only message, and in my code I implement a listener that received the notification:</p>
  
  <pre><code>this.onMessageListener = firebase.messaging().onMessage((message) =&gt; {
                  senName = message.data.senderName;
                  senUid = message.data.senderUid;
  
                  const showNotif = new firebase.notifications.Notification()
                      .setNotificationId('notificationId')
                      .setTitle(message.data.title)
                      .setBody(message.data.text)
                      .android.setChannelId('channel_id_foreground')
                      .android.setSmallIcon('ic_launcher');
                  firebase.notifications().displayNotification(showNotif)
              })
  </code></pre>
  
  <p>I have tested in simulator, everything work fine. When I run it on real device, it can call <code>onMessage</code> but <code>firebase.notifications().displayNotification(showNotif)</code> doesn't work as expect. It can not show the notification to the screen.
  Anybody know about this issue ??</p>