update README

Author: GoodCoder666

README.md

@@ -4,7 +4,11 @@
 
 项目使用Python编写，GUI使用的是 `PySide6`（Qt for Python 6）。
 
-下载地址：
+稳定版下载地址：
+
+- [https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases](https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases)
+
+预览版（alpha）下载地址：
 
 - Windows: [https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases/download/alpha/checker-win-x64.exe](https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases/download/alpha/checker-win-x64.exe)
 - Mac OS: [https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases/download/alpha/checker-mac.zip](https://github.com/GoodCoder666/GoogleTranslate_IPFinder/releases/download/alpha/checker-mac.zip)