Fix umd build for node

Author: pithu

dist/js-joda-extra.js

@@ -12,7 +12,7 @@
 		exports["JSJodaExtra"] = factory(require("js-joda"));
 	else
 		root["JSJodaExtra"] = factory(root["JSJoda"]);
-})(window, function(__WEBPACK_EXTERNAL_MODULE_js_joda__) {
+})(this, function(__WEBPACK_EXTERNAL_MODULE_js_joda__) {
 return /******/ (function(modules) { // webpackBootstrap
 /******/ 	// The module cache
 /******/ 	var installedModules = {};

dist/js-joda-extra.js.map

@@ -29,6 +29,7 @@ module.exports = {
         filename: minify ? 'js-joda-extra.min.js' : 'js-joda-extra.js',
         libraryTarget: 'umd',
         library: 'JSJodaExtra',
+        globalObject: 'this',
     },
     externals: {
         'js-joda': {