📝 Update tutorials to ES6 [ci skip]

docs/tutorial/quick-start.md

@@ -82,54 +82,54 @@ example being:
 ```javascript
 const electron = require('electron')
 // Module to control application life.
-const app = electron.app
+const app = electron.app;
 // Module to create native browser window.
-const BrowserWindow = electron.BrowserWindow
+const BrowserWindow = electron.BrowserWindow;
 
 // 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.
-let mainWindow
+let mainWindow;
 
 function createWindow () {
   // Create the browser window.
-  mainWindow = new BrowserWindow({width: 800, height: 600})
+  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()
+  mainWindow.webContents.openDevTools();
 
   // Emitted when the window is closed.
-  mainWindow.on('closed', function () {
+  mainWindow.on('closed', () => {
     // Dereference the window object, usually you would store windows
     // in an array if your app supports multi windows, this is the time
     // when you should delete the corresponding element.
-    mainWindow = null
-  })
+    mainWindow = null;
+  });
 }
 
 // This method will be called when Electron has finished
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
-app.on('ready', createWindow)
+app.on('ready', createWindow);
 
 // Quit when all windows are closed.
-app.on('window-all-closed', function () {
+app.on('window-all-closed', () => {
   // On OS X it is common for applications and their menu bar
   // to stay active until the user quits explicitly with Cmd + Q
   if (process.platform !== 'darwin') {
-    app.quit()
+    app.quit();
   }
-})
+});
 
-app.on('activate', function () {
+app.on('activate', () => {
   // On OS X it's common to re-create a window in the app when the
   // dock icon is clicked and there are no other windows open.
   if (mainWindow === null) {
-    createWindow()
+    createWindow();
   }
-})
+});
 
 // In this file you can include the rest of your app's specific main process
 // code. You can also put them in separate files and require them here.