refactor(es6): Upgrade DllModuleFactory to es6

lib/DllModuleFactory.js

@@ -2,18 +2,19 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
+"use strict";
+
 var Tapable = require("tapable");
 var DllModule = require("./DllModule");
 
-function DllModuleFactory() {
-	Tapable.call(this);
+class DllModuleFactory extends Tapable {
+	constructor() {
+		super();
+	}
+	create(data, callback) {
+		let dependency = data.dependencies[0];
+		callback(null, new DllModule(data.context, dependency.dependencies, dependency.name, dependency.type));
+	}
 }
-module.exports = DllModuleFactory;
 
-DllModuleFactory.prototype = Object.create(Tapable.prototype);
-DllModuleFactory.prototype.constructor = DllModuleFactory;
-
-DllModuleFactory.prototype.create = function(data, callback) {
-	var dependency = data.dependencies[0];
-	callback(null, new DllModule(data.context, dependency.dependencies, dependency.name, dependency.type));
-};
+module.exports = DllModuleFactory;