update wechat link (#1113)

README-CN.md

@@ -5,7 +5,7 @@
 </p>
 
 <p align="center">
-  <a href="https://cdn.nlark.com/yuque/0/2019/png/208152/1566289806040-08cc1c7b-7762-476b-a397-f1bbe46da5bc.png"><img src="https://img.shields.io/badge/WeChat-%E5%BE%AE%E4%BF%A1-brightgreen" alt="WeiXin"></a>
+  <a href="https://wx3.sinaimg.cn/large/007M23CKgy1g81fjujme2j30h40kvadn.jpg"><img src="https://img.shields.io/badge/WeChat-%E5%BE%AE%E4%BF%A1-brightgreen" alt="WeiXin"></a>
   <a href="https://www.zhihu.com/org/nebulagraph/activities"><img src="https://img.shields.io/badge/Zhihu-%E7%9F%A5%E4%B9%8E-blue" alt="Zhihu"></a>
   <a href="https://segmentfault.com/t/nebula"><img src="https://img.shields.io/badge/SegmentFault-%E6%80%9D%E5%90%A6-green" alt="SegmentFault"></a>
   <a href="https://weibo.com/p/1006067122684542/home?from=page_100606&mod=TAB#place"><img src="https://img.shields.io/badge/Weibo-%E5%BE%AE%E5%8D%9A-red" alt="Sina Weibo"></a>
@@ -47,7 +47,7 @@
 
 - 访问官网 [Home Page](http://nebula-graph.io/)。
 
--  [![WeiXin](https://img.shields.io/badge/WeChat-%E5%BE%AE%E4%BF%A1-brightgreen)](https://cdn.nlark.com/yuque/0/2019/png/208152/1566289806040-08cc1c7b-7762-476b-a397-f1bbe46da5bc.png)
+-  [![WeiXin](https://img.shields.io/badge/WeChat-%E5%BE%AE%E4%BF%A1-brightgreen)](https://wx3.sinaimg.cn/large/007M23CKgy1g81fjujme2j30h40kvadn.jpg)
 [![Zhihu](https://img.shields.io/badge/Zhihu-%E7%9F%A5%E4%B9%8E-blue)](https://www.zhihu.com/org/nebulagraph/activities)
 [![SegmentFault](https://img.shields.io/badge/SegmentFault-%E6%80%9D%E5%90%A6-green)](https://segmentfault.com/t/nebula)
 [![Sina Weibo](https://img.shields.io/badge/Weibo-%E5%BE%AE%E5%8D%9A-red)](https://weibo.com/p/1006067122684542/home?from=page_100606&mod=TAB#place)