Issue #2950993 by Kingdutch: Support and require Drupal 8.5.0

composer.json

@@ -15,6 +15,7 @@
         }
     ],
     "require": {
+        "drupal/core": "^8.5",
         "drupal/metatag": "^1.3",
         "goalgorilla/rtseo.js": "^2.0"
     }

yoast_seo.info.yml

@@ -10,6 +10,7 @@ dependencies:
   - metatag
   - path
   - views
+  - system (>=8.5.0)
 
 test_dependencies:
   - node