修改等级信息调用接口method的值app.Passport.vip为app.passport.vip

Code Review By Rock Zhang

@@ -25,7 +25,7 @@ class GradeData
         $param = Yohobuy::param();
         $param['yh_channel'] = $channel;
         $param['uid'] = $uid;
-        $param['method'] = 'app.Passport.vip';
+        $param['method'] = 'app.passport.vip';
         $param['client_secret'] = Sign::getSign($param);
         $urlList['grade'] = Yohobuy::httpBuildQuery(Yohobuy::API_URL, $param);