in demo, no need to install six first

zhangchunlin · zhangchunlin · commit 3242f31a96c6 · 2019-04-02T18:06:11.000+08:00
diff --git a/demo/README.md b/demo/README.md
@@ -3,7 +3,6 @@
 pip install dependent packages, in demo root directory run:
 
 ```
-pip install six
 pip install -r requirements.txt
 ```
 
