Netlify Build Public Beta Compatibility

Pull requests

• #22 Update Node.js to 10,12,13 (Renovate Bot)
• #20 Upgrade to latest version of Netlify Build (ehmicky)
• #16 Update installation instructions (Jessica Parsons)
• #11 Update nyc to the latest version 🚀 (greenkeeper[bot])
• #12 Update eslint-plugin-node to the latest version 🚀 (greenkeeper[bot])

Commits to master

• Activate renovate (Peter Müller)
• Update to prettier 2 and use eslint to run it (Peter Müller)
• Switch netlify config from deprecated yaml to toml (Peter Müller)
• Update dependencies and run audit (Peter Müller)