make sure travis runs with a recent bundler
make sure travis runs with a recent bundler

Change-Id: Ie040e810fdc21e296fec5717843aabb24975c69f

instructure/inst-jobs,aspushkinus/canvas-jobs,instructure/inst-jobs,aspushkinus/canvas-jobs,aspushkinus/canvas-jobs,instructure/inst-jobs,instructure/inst-jobs,instructure/canvas-jobs,instructure/canvas-jobs,instructure/canvas-jobs,instructure/canvas-jobs