update upgrade command

README.md

@@ -61,12 +61,13 @@ python oneforall.py --help
 
 3. **更新**
 
-❗注意：如果你之前已经克隆了项目运行之前请**备份**自己修改过的文件到项目外的地方（如**config.py**），然后执行以下命令**更新**项目：
+执行以下命令**更新**项目（可保存对`/config/setting.py`和`/config/api.py`的修改）：
 
 ```bash
-git fetch --all
-git reset --hard origin/master
-git pull
+git stash        # 暂存本地的修改
+git fetch --all  # 拉取项目更新
+git pull         # 下载覆盖
+git stash pop    # 释放本地修改
 ```
 </details>
 

docs/en-us/README.md

@@ -65,12 +65,13 @@ For other system platforms, please read [dependency installation](https://github
 
 3. **Update**
 
-❗Note: If you have cloned the project before, please backup modified files (such as **./config**) before updating, then run the following command to **update** project:
+Run the following command to **update** project ( maintain your updates to `/config/setting.py`and`/config/api.py`):
 
 ```bash
-git fetch --all
-git reset --hard origin/master
-git pull
+git stash        # Stash local Git changes
+git fetch --all  # Fetch updates
+git pull         # Pull updates
+git stash pop    # Apply the local Git changes stash
 ```
 </details>