drupal/core and webflo/drupal-core-require-dev should use the same version constraint (#28)

Author: webflo

composer.json

@@ -45,7 +45,7 @@
         "webmozart/path-util": "^2.3"
     },
     "require-dev": {
-        "webflo/drupal-core-require-dev": "~8.4"
+        "webflo/drupal-core-require-dev": "~8.5"
     },
     "conflict": {
         "drupal/drupal": "*"