自动更新bug

@@ -88,7 +88,7 @@ class HomePageState extends State<HomePage> with WidgetsBindingObserver {
       _getIntent();
       Future.delayed(Duration(milliseconds: 30000), () {
         ContactModel.getInstance().uploadLocalContact(context);
-        UpdateModel updateModel = new UpdateModel();
+        UpdateModel updateModel = Provider.of<UpdateModel>(context);
         updateModel.checkUpdate(context, showToast: false);
       });
       timer = Timer.periodic(Duration(minutes: 3), (_) {