Add sing-box support

Build/build-speedtest-domainset.ts

@@ -252,6 +252,7 @@ export const buildSpeedtestDomainSet = task(require.main === module, __filename)
     'domainset',
     path.resolve(__dirname, '../List/domainset/speedtest.conf'),
     path.resolve(__dirname, '../Clash/domainset/speedtest.txt'),
+    path.resolve(__dirname, '../sing-box/domainset/speedtest.json'),
     path.resolve(__dirname, '../Clash/clash_mrs_domain/speedtest.mrs')
   );
 });