fix change name

src/components/UserNameForm.js

@@ -75,7 +75,7 @@ class EmailForm extends React.Component {
       <Form onSubmit={this.onSubmit}>
         <FormItem {...usernameProps.fromItem}>
           {getFieldDecorator('username', { ...usernameProps.decorator })(
-            <Input {...usernameProps.input}/>,
+            <Input {...usernameProps.input} disabled/>,
           )}
           {
             <div class="alert alert-warning" role="alert">改名已经关闭。改名将在1月，4月，7月和10月的第一周开启。</div>