Update README.md

Create-Peace · web-flow · commit 39fa7a191784 · 2021-08-01T20:36:57.000+08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # 基于Vue实现的Tree组件支持拖拽
 
+### 最新的代码在dev分支
+
 ## Project setup
 ```
 yarn install
