message: chore(package): update electron-builder to version 20.8.1
  Closes
diff: "copy-webpack-plugin": "4.5.1",
  "css-loader": "0.28.11",
  "electron": "1.8.4",
  - "electron-builder": "20.6.2",
  + "electron-builder": "20.8.1",
  "empty": "0.10.1",
  "enzyme": "3.3.0",
  "enzyme-adapter-react-16": "1.1.1",
  