better debug output for nameserver

bin/dig.js

@@ -214,7 +214,7 @@ function request(query, opts) {
     }
 
     if (opts.debug) {
-      console.log('querying ' + nameserver + ':' + opts.port);
+      console.log("querying '" + nameserver + "':'" + opts.port + "'");
     }
     server.send(Buffer.from(queryAb), opts.port, nameserver, function () {
       if (opts.debug) {