Some minor codestyle improvements due to jshint

src/main/certificateStore.js

@@ -25,7 +25,7 @@ function getHost(targetURL) {
 }
 
 var CertificateStore = function(storeFile) {
-  this.storeFile = storeFile
+  this.storeFile = storeFile;
   try {
     this.data = JSON.parse(fs.readFileSync(storeFile, 'utf-8'));
   }

src/main/menus/app.js

@@ -177,7 +177,7 @@ var createTemplate = function(mainWindow, config) {
       },
       enabled: (config.teams.length > 1)
     }]
-  }
+  };
   template.push(window_menu);
 
   template.push({
@@ -185,7 +185,7 @@ var createTemplate = function(mainWindow, config) {
     submenu: [{
       label: `${app_name} Docs`,
       click: function() {
-        electron.shell.openExternal('http://docs.mattermost.com')
+        electron.shell.openExternal('http://docs.mattermost.com');
       }
     }, {
       type: 'separator'

src/main/menus/tray.js

@@ -2,8 +2,7 @@
 
 const {
   app,
-  Menu,
-  MenuItem
+  Menu
 } = require('electron');
 
 function createTemplate(mainWindow, config) {
@@ -48,7 +47,7 @@ var createMenu = function(mainWindow, config) {
 };
 
 function showOrRestore(window) {
-  window.isMinimized() ? window.restore() : window.show()
+  window.isMinimized() ? window.restore() : window.show();
 }
 
 module.exports = {