Update README_cn.md: replace logo with new one

ss41979310 · web-flow · commit 3697e8b826f8 · 2023-09-22T16:17:42.000+08:00
diff --git a/README_cn.md b/README_cn.md
@@ -1,7 +1,7 @@
 # CodeFuse-MFTCoder: 多任务微调代码大模型
 
 <p align="center">
-  <img src="./assets/codefuse_logo_blue.png" width="100%" />
+  <img src="./assets/github-codefuse-logo-update.jpg" width="100%" />
 </p>
 
 
