Update README requirements
Update README requirements

Change-Id: I4153eba6dd1031982414a3a106605a040cd13974

mtougeron/python-openstacksdk,dtroyer/python-openstacksdk,dudymas/python-openstacksdk,briancurtin/python-openstacksdk,dtroyer/python-openstacksdk,briancurtin/python-openstacksdk,stackforge/python-openstacksdk,mtougeron/python-openstacksdk,dudymas/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk