Use proxy insted of Array.observe, bump electron version

main.js

@@ -1,20 +1,20 @@
 'use strict';
+const path = require('path');
 const electron = require('electron');
 const app = electron.app;
 const BrowserWindow = electron.BrowserWindow;
 const globalShortcut = electron.globalShortcut;
 const ipc = electron.ipcMain;
 const Tray = electron.Tray;
 const Menu = electron.Menu;
-const path = require('path');
 const dataStore = require('./src/data-store');
 
 // Show debug tools in debugging mode.
 if (dataStore.debug()) {
 	require('electron-debug')({showDevTools: true});
 }
 
-const rulers = [];
+let rulers;
 let settingsWindow;
 let helpWindow;
 let lastFocusedRuler;
@@ -206,8 +206,12 @@ function setup() {
 	Menu.setApplicationMenu(appMenu);
 
 	// We observe changes on the `rulers` array to enable/disable the toggle menu.
-	Array.observe(rulers, () => {
-		toggleRulersMenu.enabled = Boolean(rulers.length);
+	rulers = new Proxy([], { // eslint-disable-line
+		set(target, property, value) {
+			target[property] = value;
+			toggleRulersMenu.enabled = Boolean(target.length);
+			return true;
+		}
 	});
 
 	globalShortcut.register('Command + Control + T', toggleRulerCommand);

package.json

@@ -7,7 +7,7 @@
     "test": "xo",
     "start": "electron main.js",
     "debug": "electron main.js --debug",
-    "package": "electron-packager . linear --platform=darwin --arch=all --version=0.35.4 --icon=src/assets/images/lrMacIcon.icns --out=dist --overwrite"
+    "package": "electron-packager . linear --platform=darwin --arch=all --version=1.2.2 --icon=src/assets/images/lrMacIcon.icns --out=dist --overwrite"
   },
   "repository": {
     "type": "git",
@@ -22,8 +22,8 @@
   "license": "MIT",
   "homepage": "http://mikaa123.github.io/linear-website/",
   "devDependencies": {
-    "electron-packager": "^5.1.1",
-    "electron-prebuilt": "^0.35.0",
+    "electron-packager": "^7.0.3",
+    "electron-prebuilt": "^1.2.2",
     "xo": "^0.13.0"
   },
   "dependencies": {