Remove special pip install commands from AppVeyor
Remove special pip install commands from AppVeyor

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