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

Closes #61

Author: greenkeeper[bot]

package.json

@@ -120,7 +120,7 @@
     "@ionic/angular": "4.4.0",
     "@ionic/angular-toolkit": "^1.5.1",
     "@ionic/storage": "^2.2.0",
-    "@nguniversal/express-engine": "^7.1.1",
+    "@nguniversal/express-engine": "^8.2.6",
     "@ngx-meta/core": "^7.0.0",
     "@rucken/core": "^3.9.13",
     "@types/object-path": "^0.11.0",