Stated versions, fixed Python 2 setup bug
Stated versions, fixed Python 2 setup bug

newlawrence/poliastro,poliastro/poliastro,Juanlu001/poliastro,Juanlu001/poliastro,anhiga/poliastro,Juanlu001/poliastro,anhiga/poliastro,newlawrence/poliastro,anhiga/poliastro,newlawrence/poliastro