npmのグローバルインストールを不要にする

package.json

@@ -6,11 +6,13 @@
   "author": "Yuya Ochiai",
   "license": "MIT",
   "scripts": {
-    "postinstall": "cd src && npm install"
+    "postinstall": "cd src && npm install",
+    "start": "electron src"
   },
   "devDependencies": {
     "electron-connect": "^0.3.3",
     "electron-packager": "^5.1.0",
+    "electron-prebuilt": "^0.33.6",
     "gulp": "^3.9.0",
     "gulp-jsbeautifier": "^1.0.1"
   }