title: Notification vibrate issue for android 8.0
body: <p>i create notification channel to show notification in android 8.0 as below</p>
  
  <pre><code> NotificationChannel uploadChannel = new NotificationChannel(Constants.NOTIFICATION_CHANNEL_UPLOAD_ID,"Uploads", NotificationManager.IMPORTANCE_LOW);
   uploadChannel.enableLights(false);
   uploadChannel.setDescription("Uploads Channel");
   notificationManager.createNotificationChannel(uploadChannel);
  </code></pre>
  
  <p>each time i show notification the phone vibrate many times. 
  i disable vibrate from notification channel as below</p>
  
  <pre><code>uploadChannel.enableVibration(false);
  </code></pre>
  
  <p>i create notification as below</p>
  
  <pre><code> NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, Constants.NOTIFICATION_CHANNEL_UPLOAD_ID);
  </code></pre>
  
  <p>but it is not working phone is vibrating with each notification. </p>