Test on PyPy3, fix #98
Test on PyPy3, fix #98

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