update README

fluid/DeepQNetwork/README.md

@@ -25,8 +25,8 @@ Based on PaddlePaddle's next-generation API Fluid, the DQN model of deep reinfor
     + ale_python_interface
 
 + Install Dependencies:
-    + Install PaddlePaddle
-    Recommended to compile and install PaddlePaddle from source code
+    + Install PaddlePaddle:
+        recommended to compile and install PaddlePaddle from source code
     + Install other dependencies:
         ```
         pip install -r requirement.txt 

fluid/DeepQNetwork/README_cn.md

@@ -23,9 +23,9 @@
     + ale_python_interface
 
 + 下载依赖：
-    + 安装PaddlePaddle
+    + 安装PaddlePaddle：
         建议通过PaddlePaddle源码进行编译安装    
-    + 下载其它依赖
+    + 下载其它依赖：
         ```
         pip install -r requirement.txt 
         pip install gym[atari]