Update gitignore (sorry)

electron/node_modules/xmlbuilder/lib/XMLDOMErrorHandler.js

@@ -0,0 +1,20 @@
+// Generated by CoffeeScript 2.4.1
+(function() {
+  // Represents the error handler for DOM operations
+  var XMLDOMErrorHandler;
+
+  module.exports = XMLDOMErrorHandler = class XMLDOMErrorHandler {
+    // Initializes a new instance of `XMLDOMErrorHandler`
+
+    constructor() {}
+
+    // Called on the error handler when an error occurs.
+
+    // `error` the error message as a string
+    handleError(error) {
+      throw new Error(error);
+    }
+
+  };
+
+}).call(this);