fix(@angular-devkit/build-ng-packagr): update to ng-packagr v3

Author: dherges

packages/angular_devkit/build_ng_packagr/package.json

@@ -14,6 +14,6 @@
     "rxjs": "^6.0.0"
   },
   "peerDependencies": {
-    "ng-packagr": "^2.2.0 || ^3.0.0-rc.0"
+    "ng-packagr": "^3.0.0"
   }
 }