message: try adding engines field
diff: "develop": "gatsby develop",
  "now-build": "cd .. && yarn && cd docs && gatsby build --prefix-paths"
  },
  + "engines": {
  + "node" : ">=8.11.0"
  + },
  "dependencies": {
  "@primer/gatsby-theme-doctocat": "^0.16.6",
  "@primer/octicons-react": "^9.2.0",
  