re-added empty line after use statements

lib/Gedmo/Sortable/Entity/Repository/SortableRepository.php

@@ -5,6 +5,7 @@ namespace Gedmo\Sortable\Entity\Repository;
 use Doctrine\ORM\EntityRepository,
     Doctrine\ORM\EntityManager,
     Doctrine\ORM\Mapping\ClassMetadata;
+    
 /**
  * Sortable Repository
  *