Small fix for sqlalchemy 1.0.0
Small fix for sqlalchemy 1.0.0

cowlicks/odo,cpcloud/odo,alexmojaki/odo,quantopian/odo,blaze/odo,blaze/odo,ContinuumIO/odo,ywang007/odo,quantopian/odo,ContinuumIO/odo,cowlicks/odo,Dannnno/odo,alexmojaki/odo,Dannnno/odo,ywang007/odo,cpcloud/odo