Added ipywidgets as a dependency
Added ipywidgets as a dependency

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