message: suggest node >=8
diff: "description": "Primer react components",
  "main": "dist/index.umd.js",
  "module": "dist/index.esm.js",
  + "engines": {
  + "node": ">=8"
  + },
  "scripts": {
  "prebuild": "rm -rf dist",
  "build": "NODE_ENV=production rollup -c",
  