Update README.md

README.md

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 <p align="center">
-  <a href="./README_EN.md">English</a> | 
-  <a href="./">中文</a>
+  <a href="./README.md">English</a> | 
+  <a href="./README_CN.md">中文</a>
 </p>
 <h1 align="center">SafeLine - The Best WAF For Community</h1>