Add known users

README.md

@@ -147,3 +147,6 @@ The project is licensed under the [Apache 2 license](https://github.com/ctripcor
 ![麦芽金服](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/maiyabank.png) 
 ![蜂向科技](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/fengunion.png) 
 ![即科金融](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/geex-logo.png) 
+![贝壳网](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/beike.png)
+![有赞](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/youzan.png)
+![云集汇通](https://github.com/ctripcorp/apollo/blob/master/doc/images/known-users/yunjihuitong.png)