add the right use

lib/Gedmo/Translatable/Entity/Repository/TranslationRepository.php

@@ -7,6 +7,7 @@ use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\Query;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\Mapping\ClassMetadata;
+use Doctrine\ORM\Mapping\ClassMetadataInfo;
 use Gedmo\Tool\Wrapper\EntityWrapper;
 use Gedmo\Translatable\Mapping\Event\Adapter\ORM as TranslatableAdapterORM;
 use Doctrine\DBAL\Types\Type;