Updated changelog from 0.3.x
Updated changelog from 0.3.x

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