fix Readme

Author: MrChengmo

README.md

@@ -175,5 +175,5 @@ python -m paddlerec.run -m paddlerec.models.rank.dnn
 
 亦可通过以下方式与我们沟通交流：
 
-<p align="center"><img width="200" height="200"  src="doc/imgs/wechet.png"/>&#8194;&#8194;&#8194;&#8194;&#8194;<img width="200" height="200" margin="500" src="./doc/imgs/QQ_group.png"/>&#8194;&#8194;&#8194;&#8194;&#8194<img width="200" height="200"  src="doc/imgs/weixin_supporter.png"/></p>
-<p align="center">  &#8194;&#8194;&#8194;&#8194;&#8194;&#8194;微信公众号&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;PaddleRec交流QQ群&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;PaddleRec微信小助手</p>
+<p align="center"><img width="200" height="200" margin="500" src="./doc/imgs/QQ_group.png"/>&#8194;&#8194;&#8194;&#8194;&#8194<img width="200" height="200"  src="doc/imgs/weixin_supporter.png"/></p>
+<p align="center">PaddleRec交流QQ群&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;&#8194;PaddleRec微信小助手</p>