Changed getItemResourceForModel visibility to protected to allow overriding

Author: NiallSmyth

src/Resources/ModelRestResource.php

@@ -558,7 +558,7 @@ private function fetchItems($rangeStart, $rangeEnd, RhubarbDateTime $since = nul
         return [$items, sizeof($collection)];
     }
 
-    private function getItemResourceForModel($model)
+    protected function getItemResourceForModel($model)
     {
         $resource = clone $this;
         $resource->parentResource = $this;