message: fix(aio): add link to v5 docs
  Fixes
  PR Close
diff: ],
  "docVersions": [
  - { "title": "v4 (LTS)", "url": "https://v4.angular.io" },
  + { "title": "v5", "url": "https://v5.angular.io" },
  + { "title": "v4", "url": "https://v4.angular.io" },
  { "title": "v2", "url": "https://v2.angular.io" },
  { "title": "AngularDart", "url": "https://webdev.dartlang.org/angular" }
  -
  ]
  }
  