🚧 remove new keyword to get inline with dart 2 code standard.

grid_layout/lib/main.dart

@@ -1,20 +1,20 @@
 import 'package:flutter/material.dart';
 import 'package:grid_layout/gridview.dart';
 
-void main() => runApp(new MyApp());
+void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
-  final MyGridView myGridView = new MyGridView();
+  final MyGridView myGridView = MyGridView();
 
   @override
   Widget build(BuildContext context) {
-    return new MaterialApp(
+    return MaterialApp(
       debugShowCheckedModeBanner: false,
-      home: new Scaffold(
-        appBar: new AppBar(
+      home: Scaffold(
+        appBar: AppBar(
           // Here we take the value from the MyHomePage object that was created by
           // the App.build method, and use it to set our appbar title.
-          title: new Text("GridView Example"),
+          title: Text("GridView Example"),
         ),
         body: myGridView.build(),
       ),