message: Ad format and lint scripts
diff: "build": "rollup -c",
  "clean": "rm -rf build && mkdir build",
  "deploy": "npm run lint && scripts/deploy.sh",
  - "lint": "tslint -p .",
  + "format": "tslint -p . --fix && prettier --write '{src,test}/**/*.ts'",
  + "lint": "tslint -p . && prettier --list-different '{src,test}/**/*.ts'",
  "postbuild": "uglifyjs build/vega-embed.js -cm > build/vega-embed.min.js",
  "prebuild": "npm run clean && tsc",
  "prepublishOnly": "npm run build",
  