v2 RC1 Changes (#7)

- Changes `items` and `hasItems` on `DocumentList` to be properties
- Updates dependent option/result library, which contains similar changes

Reviewed-on: #7

src/Custom.php

@@ -89,7 +89,7 @@ class Custom
      */
     public static function array(string $query, array $parameters, Mapper $mapper): array
     {
-        return iterator_to_array(self::list($query, $parameters, $mapper)->items());
+        return iterator_to_array(self::list($query, $parameters, $mapper)->items);
     }
 
     /**