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

using_alert_dialog/lib/main.dart

@@ -1,34 +1,34 @@
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(new MaterialApp(
-    home: new MyHome(),
+  runApp(MaterialApp(
+    home: MyHome(),
   ));
 }
 
 class MyHome extends StatefulWidget {
   @override
-  MyHomeState createState() => new MyHomeState();
+  MyHomeState createState() => MyHomeState();
 }
 
 class MyHomeState extends State<MyHome> {
   // Generate dialog
-  AlertDialog dialog = new AlertDialog(
-      content: new Text(
+  AlertDialog dialog = AlertDialog(
+      content: Text(
     "Hello World!",
-    style: new TextStyle(fontSize: 30.0),
+    style: TextStyle(fontSize: 30.0),
   ));
 
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
-        appBar: new AppBar(
-          title: new Text("Using Alert Dialog"),
+    return Scaffold(
+        appBar: AppBar(
+          title: Text("Using Alert Dialog"),
         ),
-        body: new Container(
-          child: new Center(
-            child: new RaisedButton(
-                child: new Text("Hit to alert!"),
+        body: Container(
+          child: Center(
+            child: RaisedButton(
+                child: Text("Hit to alert!"),
                 // On press of the button
                 onPressed: () {
                   // Show dialog