Fix npm test failures

index.js

@@ -1,9 +1,9 @@
 'use strict';
-var lazyRequire = require('lazy-req')(require);
 var spawn = require('child_process').spawn;
 var path = require('path');
 var format = require('util').format;
-var Configstore = lazyRequire('configstore');
+var lazyRequire = require('lazy-req')(require);
+var configstore = lazyRequire('configstore');
 var chalk = lazyRequire('chalk');
 var semverDiff = lazyRequire('semver-diff');
 var latestVersion = lazyRequire('latest-version');
@@ -36,7 +36,8 @@ function UpdateNotifier(options) {
 
 	if (!this.hasCallback) {
 		try {
-			this.config = new (Configstore())('update-notifier-' + this.packageName, {
+			var ConfigStore = configstore();
+			this.config = new ConfigStore('update-notifier-' + this.packageName, {
 				optOut: false,
 				// init with the current time so the first check is only
 				// after the set interval, so not to bother users right away