docs(tech skills): update the picture of skill stack tutorial-2020-02-16.png

Author: zhonghuasheng

README.md

@@ -264,6 +264,6 @@
 <h2 align="center">技术栈</h2>
 <center>
 
-![](tutorial-2020-02-15.png)
+![](tutorial-2020-02-16.png)
 
 </center>