Apply no-var eslint rule

src/main/allowProtocolDialog.js

@@ -9,7 +9,7 @@ import fs from 'fs';
 import {app, dialog, ipcMain, shell} from 'electron';
 
 const allowedProtocolFile = path.resolve(app.getPath('userData'), 'allowedProtocols.json');
-var allowedProtocols = [];
+let allowedProtocols = [];
 
 function init(mainWindow) {
   fs.readFile(allowedProtocolFile, 'utf-8', (err, data) => {

src/main/certificateStore.js

@@ -56,7 +56,7 @@ CertificateStore.prototype.isExisting = function isExisting(targetURL) {
 };
 
 CertificateStore.prototype.isTrusted = function isTrusted(targetURL, certificate) {
-  var host = getHost(targetURL);
+  const host = getHost(targetURL);
   if (!this.isExisting(targetURL)) {
     return false;
   }

src/main/mainWindow.js

@@ -7,7 +7,7 @@ import path from 'path';
 import {app, BrowserWindow} from 'electron';
 
 function saveWindowState(file, window) {
-  var windowState = window.getBounds();
+  const windowState = window.getBounds();
   windowState.maximized = window.isMaximized();
   windowState.fullscreen = window.isFullScreen();
   try {
@@ -26,7 +26,7 @@ function createMainWindow(config, options) {
 
   // Create the browser window.
   const boundsInfoPath = path.join(app.getPath('userData'), 'bounds-info.json');
-  var windowOptions;
+  let windowOptions;
   try {
     windowOptions = JSON.parse(fs.readFileSync(boundsInfoPath, 'utf-8'));
   } catch (e) {

src/main/menus/app.js

@@ -15,11 +15,11 @@ function createTemplate(mainWindow, config, isDev) {
     type: 'separator',
   };
 
-  var appName = app.getName();
-  var firstMenuName = (process.platform === 'darwin') ? appName : 'File';
-  var template = [];
+  const appName = app.getName();
+  const firstMenuName = (process.platform === 'darwin') ? appName : 'File';
+  const template = [];
 
-  var platformAppMenu = process.platform === 'darwin' ? [{
+  let platformAppMenu = process.platform === 'darwin' ? [{
     label: 'About ' + appName,
     role: 'about',
     click() {
@@ -217,7 +217,7 @@ function createTemplate(mainWindow, config, isDev) {
     }],
   };
   template.push(windowMenu);
-  var submenu = [];
+  const submenu = [];
   if (buildConfig.helpLink) {
     submenu.push({
       label: 'Learn More...',

src/main/menus/tray.js

@@ -10,7 +10,7 @@ import settings from '../../common/settings';
 function createTemplate(mainWindow, config, isDev) {
   const settingsURL = isDev ? 'http://localhost:8080/browser/settings.html' : `file://${app.getAppPath()}/browser/settings.html`;
   const teams = settings.mergeDefaultTeams(config.teams);
-  var template = [
+  const template = [
     ...teams.slice(0, 9).map((team, i) => {
       return {
         label: team.name,