update electron-packager; enable dark mode support for macOS mojave

gruntfile.js

@@ -149,6 +149,7 @@ module.exports = function (grunt) {
       case 'osx':
         Object.assign(opts, {
           platform: 'darwin',
+          darwinDarkModeSupport: true,
           icon: path.join(__dirname, 'resources/app.icns'),
           'app-category-type': 'public.app-category.developer-tools'
         })

package.json

@@ -124,7 +124,7 @@
     "devtron": "^1.1.0",
     "dom-storage": "^2.0.2",
     "electron": "2.0.7",
-    "electron-packager": "^12.0.0",
+    "electron-packager": "^12.2.0",
     "eslint": "^3.13.1",
     "eslint-config-standard": "^6.2.1",
     "eslint-config-standard-jsx": "^3.2.0",