Update common-node.js

i was just reading the source and noticed this, if there is some reason it won't work please let me know

Author: devsnek

lib/common-node.js

@@ -66,13 +66,10 @@ exports.querystringParse = function (q) {
  * @return {string}
  */
 exports.querystringStringify = function (obj) {
-  var saved = querystring.escape
-  querystring.escape = escape // global
-  var ret = querystring.stringify(obj)
+  var ret = querystring.stringify(obj, { encodeURIComponent: escape })
   ret = ret.replace(/[@*/+]/g, function (char) {
     // `escape` doesn't encode the characters @*/+ so we do it manually
     return '%' + char.charCodeAt(0).toString(16).toUpperCase()
   })
-  querystring.escape = saved
   return ret
 }