GitHub 资源加速代理
加速访问 GitHub 资源，支持 Releases、Raw、Code 等资源加速下载
支持的链接格式示例：
- https://github.com/username/repo/releases/download/tag/file.zip
- https://github.com/username/repo/archive/master.zip
- https://github.com/username/repo/blob/master/dir/file.ext
- https://raw.githubusercontent.com/username/repo/master/file.ext
- https://gist.github.com/username/gistid/file