Add electron-updater requirement and import

package.json

@@ -34,6 +34,7 @@
     "bluebird": "^3.5.1",
     "classnames": "^2.2.5",
     "electron-dl": "^1.6.0",
+    "electron-updater": "^2.16.1",
     "formik": "^0.10.4",
     "from2": "^2.3.0",
     "install": "^0.10.2",

src/main/index.js

@@ -9,6 +9,7 @@ import Keytar from 'keytar';
 import ChildProcess from 'child_process';
 import Assert from 'assert';
 import { app, BrowserWindow, globalShortcut, ipcMain, Menu, Tray } from 'electron';
+import { autoUpdater } from 'electron-updater';
 import mainMenu from './menu/mainMenu';
 import contextMenu from './menu/contextMenu';