message: Add format script
diff: "main": "dist/index.js",
  "scripts": {
  "build": "tsc",
  + "format": "prettier --write 'src/**/*.ts'",
  "lint": "yarn lint:src && yarn lint:test",
  "lint:src": "eslint --ext .ts src",
  "lint:test": "eslint --ext .test.ts test",
  