feat: add support for URL safe encoding

due to a bug in node.js some clients will end up encoding the value
before base64 which results in the incorrect value being parsed.
ref: nodejs/node#31439

index.js

@@ -112,7 +112,7 @@ function parse (string) {
   }
 
   // decode user pass
-  var userPass = USER_PASS_REGEXP.exec(decodeBase64(match[1]))
+  var userPass = USER_PASS_REGEXP.exec(decodeURIComponent(decodeBase64(match[1])))
 
   if (!userPass) {
     return undefined