Use travis retry for Python dependencies
Use travis retry for Python dependencies

opendatateam/udata,jphnoel/udata,grouan/udata,etalab/udata,davidbgk/udata,jphnoel/udata,davidbgk/udata,opendatateam/udata,davidbgk/udata,jphnoel/udata,etalab/udata,grouan/udata,opendatateam/udata,etalab/udata,grouan/udata