Backported release notes from v0.2.1
Backported release notes from v0.2.1

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