add known user

README.md

@@ -141,3 +141,4 @@ The project is licensed under the [Apache 2 license](https://github.com/ctripcor
 ![263移动通信](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/263mobile.png) 
 ![投投金融](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/toutoujinrong.png) 
 ![每天健康](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/mytijian.png) 
+![麦芽金服](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/maiyabank.png)