libzsync implementation in Golang
See http://zsync.moria.org.uk/
importgithub.com/AppImageCrafters/libzsync-go// Configuresync, _:=zsync.NewZSync("https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage.zsync")
sync.RemoteFileUrl="https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage"// Executeoutput, _:=os.Create("/tmp/appimagetool-new-x86_64.AppImage")
err=sync.Sync("/tmp/appimagetool-x86_64.AppImage", output)