refactor(conflict):

lib/widgets/elements/Form/Radio/Radio/demo.dart

@@ -22,27 +22,27 @@ class _Demo extends State<RadioADemo> {
   }
   Widget build(BuildContext context) {
     return  (
-      new Container(
+       Container(
         alignment: Alignment.centerLeft,
-        child: new Column(
+        child:  Column(
           crossAxisAlignment: CrossAxisAlignment.center,
           mainAxisSize: MainAxisSize.min,
           children: <Widget>[
-            new Radio(
+             Radio(
                 value: 1,
                 groupValue: groupValue,//当value和groupValue一致的时候则选中
                 onChanged: (T){
                   onChange(T);
                 }
             ),
-            new Radio(
+             Radio(
                 value: 2,
                 groupValue: groupValue,
                 onChanged: (T){
                   onChange(T);
                 }
             ),
-            new Radio(
+             Radio(
                 value: 3,
                 groupValue: groupValue,
                 onChanged: (T){

lib/widgets/elements/Form/Radio/Radio/index.dart

@@ -18,7 +18,6 @@ Radio widget 代表表单中的单选按钮, 当groupValue = value时代表组
 
 在表单中, 单选按钮是表示一组互斥选项按钮中的一个。当一个按钮被选中，之前选中的按钮就变为非选中的。
 
-
 ### **基本用法**
 以下是Radio的属性主产明
 - activeColor → Color - 激活时的颜色。

lib/widgets/elements/Form/Radio/RadioListTile/demo.dart

@@ -24,7 +24,7 @@ class _Demo extends State<DemoA> {
   }
   Widget build(BuildContext context) {
 
-    return new Column(
+    return  Column(
       children: <Widget>[
         RadioListTile<String>(
           title: const Text('A'),

lib/widgets/elements/Form/Radio/RadioListTile/index.dart

@@ -33,6 +33,7 @@ class _DemoState extends State<Demo> {
       contentList: [
         content1,
         new DemoA()
+
       ],
       title: 'RadioListTile',
       docUrl: 'https://docs.flutter.io/flutter/material/RadioListTile-class.html',