restrict sqlalchemy version on travis
restrict sqlalchemy version on travis

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