removed an obsolete "to do" comment in xml.js

src/xml.js

@@ -7,7 +7,7 @@
     written by Jens Mönig
     jens@moenig.org
 
-    Copyright (C) 2018 by Jens Mönig
+    Copyright (C) 2020 by Jens Mönig
 
     This file is part of Snap!.
 
@@ -67,7 +67,7 @@
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.xml = '2018-November-12';
+modules.xml = '2020-April-20';
 
 // Declarations
 
@@ -178,7 +178,7 @@ XML_Element.prototype.init = function (tag, contents, parent) {
 
 // XML_Element DOM navigation: (aside from what's inherited from Node)
 
-XML_Element.prototype.require = function (tagName, fallback) { // +++
+XML_Element.prototype.require = function (tagName, fallback) {
     // answer the first direct child with the specified tagName.
     // if it doesn't exist execute the fallback function or return the
     // fallback value, otherwise throw an error