Add tox python lib on requirements_dev
Add tox python lib on requirements_dev

jeanmask/opps,opps/opps,YACOWS/opps,williamroot/opps,opps/opps,williamroot/opps,williamroot/opps,jeanmask/opps,opps/opps,YACOWS/opps,opps/opps,YACOWS/opps,jeanmask/opps,williamroot/opps,jeanmask/opps,YACOWS/opps