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

using_bottom_nav_bar/lib/tabs/third.dart

@@ -3,22 +3,22 @@ import 'package:flutter/material.dart';
 class ThirdTab extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return new Scaffold(
+    return Scaffold(
       backgroundColor: Colors.orange,
-      body: new Container(
-        child: new Center(
-          child: new Column(
+      body: Container(
+        child: Center(
+          child: Column(
             // center the children
             mainAxisAlignment: MainAxisAlignment.center,
             children: <Widget>[
-              new Icon(
+              Icon(
                 Icons.airport_shuttle,
                 size: 160.0,
                 color: Colors.white,
               ),
-              new Text(
+              Text(
                 "Third Tab",
-                style: new TextStyle(color: Colors.white),
+                style: TextStyle(color: Colors.white),
               )
             ],
           ),