update readme

README.md

@@ -21,6 +21,8 @@
 
 # :warning: Compatibility warning :warning:
 
+When upgrading from version 3.x to version 4.0, please read the following incompatibility notes:
+
 1. If you are using an external Fooocus model (that is, the model is not located in the `repositories` directory), delete the `repositories` directory directly, and then update the `git pull`.
 2. If not, move the `repositories` directory to any directory, delete the `repositories` directory, then update the `git pull`, and move the `models` directory back to its original location when it is finished.
 

README_zh.md

@@ -21,6 +21,8 @@
 
 # :warning: 兼容性警告 :warning:
 
+如果从 3.x 版本升级到 4.0 版本，务必阅读下面不兼容说明：
+
 1. 如果你使用的是外部 Fooocus 模型（即模型不是位于 `repositories/Fooocus/models` 目录下），直接删除 `repositories` 目录，然后执行 `git pull` 更新即可
 2. 如果不是上述方式，将 `repositories/Fooocus/models` 目录移动到任意目录，删除 `repositories` 目录，然后执行 `git pull` 更新，完成后将 `models` 目录移动回原位置