message: add build task
diff: },
  "scripts": {
  "start": "cross-env NODE_ENV=development webpack --watch --progress --env.browser",
  + "build": "cross-env NODE_ENV=production webpack -p --progress --env.browser",
  "fix": "eslint --fix . --ext .jsx,.js,.ts,.tsx",
  "typecheck:watch": "tsc -p . --watch",
  "postinstall": "node-config-ts",
  