Update main.js

main.js

@@ -1,12 +1,14 @@
-var app = require('app');  // Module to control application life.
-var BrowserWindow = require('browser-window');  // Module to create native browser window.
+'use strict';
+const electron = require('electron');
+const app = electron.app;  // Module to control application life.
+const BrowserWindow = electron.BrowserWindow;  // Module to create native browser window.
 
 // Report crashes to our server.
 require('crash-reporter').start();
 
 // Keep a global reference of the window object, if you don't, the window will
 // be closed automatically when the JavaScript object is garbage collected.
-var mainWindow = null;
+let mainWindow;
 
 // Quit when all windows are closed.
 app.on('window-all-closed', function() {
@@ -24,7 +26,7 @@ app.on('ready', function() {
   mainWindow = new BrowserWindow({width: 800, height: 600});
 
   // and load the index.html of the app.
-  mainWindow.loadUrl('file://' + __dirname + '/index.html');
+  mainWindow.loadUrl(`file://${__dirname}/index.html`);
 
   // Open the DevTools.
   mainWindow.webContents.openDevTools();