message: docs(builders): add repository, homepage, bugs fields on package.json
diff: "name": "@nguniversal/builders",
  "version": "0.0.0-PLACEHOLDER",
  "description": "Angular Universal builders package",
  + "homepage": "https://github.com/angular/universal#readme",
  "license": "MIT",
  "keywords": [
  "ssr",
  "builder",
  "cli"
  ],
  + "repository": {
  + "type": "git",
  + "url": "https://github.com/angular/universal"
  + },
  + "bugs": {
  + "url": "https://github.com/angular/universal/issues"
  + },
  "main": "src/index.js",
  "typings": "src/index.d.ts",
  "builders": "builders.json",
  