update readme

examples/routers/radio.vue

@@ -1,16 +1,24 @@
 <template>
     <div>
-        <Radio-group v-model="sex">
-            <Radio :label="0">男</Radio>
-            <Radio :label="1">女</Radio>
+        <Radio-group v-model="date.sex">
+            <Radio label="male form"></Radio>
+            <Radio label="female"></Radio>
         </Radio-group>
+        <Button @click="handleChange">change</Button>
     </div>
 </template>
 <script>
     export default {
         data () {
             return {
-                sex: 0
+                date: {
+                    sex: ''
+                }
+            }
+        },
+        methods: {
+            handleChange () {
+                this.date.sex = 'male form';
             }
         }
     }