message: docs(aio): add angular-buch to resources
  adds a link to the website of our book. many thanks for reviewing this
  PR Close
diff: "rev": true,
  "title": "Essential Angular",
  "url": "https://gumroad.com/l/essential_angular"
  + },
  + "angular-buch": {
  + "desc": "The first German book about Angular 4+. Amazon Bestseller of 2017. Available in printed and electronic format (Kindle, PDF, ePub and Mobi). All sources are available on GitHub.",
  + "logo": "https://angular-buch.com/assets/img/brand.svg",
  + "rev": true,
  + "title": "Angular-Buch (German)",
  + "url": "https://angular-buch.com/"
  }
  }
  },
  