fix(package): update @ngx-meta/core to version 8.1.0

Closes #358

Author: greenkeeper[bot]

package.json

@@ -130,7 +130,7 @@
     "@fortawesome/free-solid-svg-icons": "5.8.2",
     "@nguniversal/express-engine": "7.1.1",
     "@nguniversal/module-map-ngfactory-loader": "7.1.1",
-    "@ngx-meta/core": "7.0.0",
+    "@ngx-meta/core": "8.1.0",
     "@ngx-translate/core": "11.0.1",
     "@types/dotenv": "6.1.1",
     "@types/jsonwebtoken": "8.3.2",