fix readme(mark beta)

deploy/pdserving/readme.md

-# Paddle Serving 服务部署
+# Paddle Serving 服务部署(Beta)
 
 本教程将介绍基于[Paddle Serving](https://github.com/PaddlePaddle/Serving)部署PaddleOCR在线预测服务的详细步骤。
 
@@ -13,7 +13,11 @@
 **操作系统版本：CentOS 6以上**
 
 ```
-python -m pip install paddle_serving_server_gpu paddle_serving_client paddle_serving_app
+#以下提供beta版本的paddle serving whl包，欢迎试用，正式版会在7月底正式上线
+wget --no-check-certificate https://paddle-serving.bj.bcebos.com/others/paddle_serving_server_gpu-0.3.2-py2-none-any.whl
+wget --no-check-certificate https://paddle-serving.bj.bcebos.com/others/paddle_serving_app-0.1.2-py2-none-any.whl
+python -m pip install paddle_serving_app-0.1.2-py2-none-any.whl paddle_serving_server_gpu-0.3.2-py2-none-any.whl
+python -m pip install paddle_serving_client 
 ```
 
 ### 2. 模型转换