更新文档

消息的使用.md

@@ -50,19 +50,21 @@
 
 ### 创建消息
 
-**请注意：消息类的命名空间为 `Overtrue\Wechat\Services\Message`**
+**请注意：消息工厂类的命名空间为 `Overtrue\Wechat\Message`**
 
 ```php
 <?php
 
-use Overtrue\Wechat\Wechat;
-use Overtrue\Wechat\Services\Message;
+use Overtrue\Wechat\Server;
+use Overtrue\Wechat\Message;
 
-$options = array(...);
+$appId          = 'wx3cf0f39249eb0e60';
+$token          = 'hellotest';
+$encodingAESKey = 'EJThPazwzO4k1cyXJnwQtL60zBdhWvFaHb4emv0dLVN';
 
-$wechat = Wechat::make($options);
+$server = new Server($appId, $token, $encodingAESKey);
 
-$wechat->on('event', 'subscribe', function($event){
+$server->on('event', 'subscribe', function($event){
   return Message::make('text')->content('您好！欢迎关注 overtrue');
 });
 ```