Update README.md

README.md

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 **之前刷题，一直觉得漫无目的地刷，效率很低，后来发现了两个刷题笔记，谷歌大佬高畅和阿里大佬霜神写的 LeetCode 刷题笔记。**
 
-**关注 Jack 的公众号「JackCui-AI」后台回复「03」即可获取。**
+**关注 Jack 的公众号「jackcui-ai」后台回复「03」即可获取。**
 
 <div align="center">
 <img src="https://ftp.bmp.ovh/imgs/2020/07/112254f0199e3d4f.jpg" alt="wechat" width="500" height="220" align="bottom" />
@@ -18,7 +18,7 @@
 <img src="https://cuijiahua.com/wp-content/uploads/2021/04/640.png" width="500" height="400" align="bottom" />
 </div>
 
-**关注 Jack 的公众号「JackCui-AI」后台回复「04」即可获取。**
+**关注 Jack 的公众号「jackcui-ai」后台回复「04」即可获取。**
 
 <div align="center">
 <img src="https://ftp.bmp.ovh/imgs/2020/07/112254f0199e3d4f.jpg" alt="wechat" width="500" height="220" align="bottom" />