fix: Update README.md

Update README.md

Change-Id: I1c07a63700d2f0b9c3474f95dae8d430d0ef03bb

README-zh_CN.md

@@ -147,6 +147,8 @@ Skyline 的吉祥物是九色鹿。九色鹿源自于敦煌壁画《九色鹿本
 
 ### 依赖工具
 
+> python 使用了3.7版本的新特性 Context Variables，考虑大部分系统不支持 python3.7，所以选择支持 python3.8 及以上版本
+
 - make >= 3.82
 - python >= 3.8
 - poetry >= 1.1.0 ([安装指南](https://python-poetry.org/docs/#installation))

README.md

@@ -147,6 +147,8 @@ You can now access the dashboard: `https://<ip_address>:9999`
 
 ### Dependent tools
 
+> Use the new feature Context Variables of python37. Considering that most systems do not support python37, we choose to support python38 at least.
+
 - make >= 3.82
 - python >= 3.8
 - poetry >= 1.1.0 ([Installation Guide](https://python-poetry.org/docs/#installation))