Added use Doctrine\ODM\MongoDB\LoggableCursor; in DocumentPersister

FatalErrorException: Error: Class 'Doctrine\ODM\MongoDB\Persisters\LoggableCursor' not found in /var/www/html/getitfree/vendor/doctrine/mongodb-odm/lib/Doctrine/ODM/MongoDB/Persisters/DocumentPersister.php line 429

Missing  Doctrine\ODM\MongoDB\LoggableCursor