fix compile doc

doc/COMPILE.md

@@ -9,7 +9,7 @@
 - Golang: 1.9.2 and later
 - Git：2.17.1 and later
 - CMake：3.2.2 and later
-- Python：2.7.2 and later
+- Python：2.7.2 and later / 3.6 and later
 
 It is recommended to use Docker for compilation. We have prepared the Paddle Serving compilation environment for you: 
 
@@ -54,6 +54,8 @@ make -j10
 
 execute `make install` to put targets under directory `./output`
 
+**Attention：**After the compilation is successful, the serving binary file will be generated in the ./core/general-server directory. Before starting the server, export SERVING_BIN = $ {path / to / serving / bin} is required to allow the server to use the compiled serving binary file.
+
 ## Compile Client
 
 ``` shell

doc/COMPILE_CN.md

@@ -9,7 +9,7 @@
 - Golang: 1.9.2及以上
 - Git：2.17.1及以上
 - CMake：3.2.2及以上
-- Python：2.7.2及以上
+- Python：2.7.2及以上 / 3.6及以上
 
 推荐使用Docker编译，我们已经为您准备好了Paddle Serving编译环境：
 
@@ -54,6 +54,8 @@ make -j10
 
 执行`make install`可以把目标产出放在`./output`目录下。
 
+**注意：** 编译成功后，在./core/general-server目录下会产出serving二进制文件。启动server前需要export SERVING_BIN=${path/to/serving/bin} 来让server端使用编译出的serving二进制文件。
+
 ## 编译Client部分
 
 ``` shell