chore(package): update @nguniversal/express-engine to version 8.2.6

Closes #75

Author: greenkeeper[bot]

demo/package.json

@@ -45,7 +45,7 @@
     "@angularclass/hmr": "~2.1.3",
     "@compodoc/gulp-compodoc": "0.0.10",
     "@nguniversal/common": "^7.1.1",
-    "@nguniversal/express-engine": "^7.1.1",
+    "@nguniversal/express-engine": "^8.2.6",
     "@nguniversal/module-map-ngfactory-loader": "^7.1.1",
     "@types/jest": "24.0.11",
     "@types/node": "~11.11.0",