Added message handler

src/App.vue

@@ -278,6 +278,7 @@ export default class App extends Vue {
       });
   }
 
+
   private askPermission(): Promise<NotificationPermission> {
     // Check if Notifications are supported
     if (!("Notification" in window)) {
@@ -311,6 +312,7 @@ export default class App extends Vue {
     });
   }
 
+
   async turnOnNotifications() {
     return this.askPermission()
       .then((permission) => {