Who is the driver that transported the lightest weight of shipment? Provide the full name of the driver.
lightest weight refers to Min(weight); full name refers to first_name, last_name
SELECT T2.first_name, T2.last_name FROM shipment AS T1 INNER JOIN driver AS T2 ON T1.driver_id = T2.driver_id ORDER BY T1.weight ASC LIMIT 1