docs: update readme

Author: bytemain

README.md

@@ -1,6 +1,6 @@
 # vfox-python
-Python plugin for [vfox](https://vfox.lhan.me/).
 
+Python plugin for [vfox](https://vfox.lhan.me/).
 
 ## Install
 
@@ -10,7 +10,9 @@ After installing [vfox](https://github.com/version-fox/vfox), install the plugin
 vfox add python
 ```
 
+if you want install the free-threaded mode of python, you can select the version ends with `t`, like `v3.14.0a4t`.
+
 ## Mirror
 
 You can configure the mirror by `VFOX_PYTHON_MIRROR` environment variable. The default value
-is `https://www.python.org/ftp/python/`.
+is `https://www.python.org/ftp/python/`.