update index loading for new API

main.js

@@ -1,11 +1,5 @@
-const electron = require('electron')
-// Module to control application life.
-const app = electron.app
-// Module to create native browser window.
-const BrowserWindow = electron.BrowserWindow
-
-const path = require('path')
-const url = require('url')
+// Modules to control application life and create native browser window
+const {app, BrowserWindow} = require('electron')
 
 // 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.
@@ -16,11 +10,7 @@ function createWindow () {
   mainWindow = new BrowserWindow({width: 800, height: 600})
 
   // and load the index.html of the app.
-  mainWindow.loadURL(url.format({
-    pathname: path.join(__dirname, 'index.html'),
-    protocol: 'file:',
-    slashes: true
-  }))
+  mainWindow.loadFile('index.html')
 
   // Open the DevTools.
   // mainWindow.webContents.openDevTools()