update readme

Author: niumoo

README.md

@@ -46,5 +46,5 @@
 
 
 # 交流
-![](https://user-gold-cdn.xitu.io/2019/10/25/16e00bef676251ce?imageView2/0/w/1280/h/960/format/webp/ignore-error/1)  
+![](https://user-images.githubusercontent.com/26371673/69558482-46eab080-0fe3-11ea-8fa7-d9d824b7bed4.jpg)  
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