forgot to tag source code with github issue

src/js/assets.js

@@ -212,6 +212,7 @@ var cachedAssetsManager = (function() {
 /******************************************************************************/
 
 var getTextFileFromURL = function(url, onLoad, onError) {
+    // https://github.com/gorhill/uMatrix/issues/15
     var onResponseReceived = function() {
         if ( typeof this.status === 'number' && this.status >= 200 && this.status < 300 ) {
             return onLoad.call(this);