message: fix missing item in package.json
diff: "scripts": {
  "dev:mac": "ELECTRON_DEV=true npm run start",
  "dev:win": "SET ELECTRON_DEV=true && npm run start",
  + "start": "electron .",
  "dist-mac": "build --mac",
  "dist-win": "build --win --x64",
  "dist-win-x86": "build --win --ia32",
  