Merge pull request #6 from taobig/patch-1

修复使用说明中的错误

Author: yansongda

README.md

@@ -214,7 +214,7 @@ class PayController extends Controller
     public function notify(Request $request)
     {
         $pay = new Pay($this->config);
-        $verify = $p->driver('wechat')->gateway('mp')->verify($request->getContent());
+        $verify = $pay->driver('wechat')->gateway('mp')->verify($request->getContent());
 
         if ($verify) {
             file_put_contents('notify.txt', "收到来自微信的异步通知\r\n", FILE_APPEND);
@@ -722,4 +722,4 @@ $config_biz = [
 如果您有其它支付网关的需求，或者发现本项目中需要改进的代码，**_欢迎 Fork 并提交 PR！_**
 
 ## LICENSE
-MIT
+MIT