chore(package): update @nguniversal/common to version 9.1.0

Closes #27

Author: greenkeeper[bot]

demo/package.json

@@ -46,7 +46,7 @@
     "@angular/language-service": "^7.2.15",
     "@angularclass/hmr": "~2.1.3",
     "@compodoc/gulp-compodoc": "0.0.10",
-    "@nguniversal/common": "^7.0.2",
+    "@nguniversal/common": "^9.1.0",
     "@nguniversal/express-engine": "^7.0.2",
     "@nguniversal/module-map-ngfactory-loader": "^7.0.2",
     "@types/jest": "^24.0.13",