Update README.md and README_cn.md

README.md

@@ -28,7 +28,7 @@ For this project was developed in PaddlePaddle V2 API, which is not maintained o
 - PaddlePaddle the 0.13 version
 
 ```bash
-pip install paddlepaddle==0.13
+pip install paddlepaddle-gpu==0.13
 ```
 
 ### Setup

README_cn.md

@@ -28,7 +28,7 @@
 - PaddlePaddle 0.13 版本
 
 ```bash
-pip install paddlepaddle==0.13
+pip install paddlepaddle-gpu==0.13
 ```
 
 ### 安装