message: build: update router package.json placeholder
diff: {
  "name": "@angular/router",
  - "version": "0.0.0-ROUTERPLACEHOLDER",
  + "version": "0.0.0-PLACEHOLDER",
  "description": "Angular - the routing library",
  "main": "./bundles/router.umd.js",
  "module": "./@angular/router.es5.js",
  