Adding 4.1 whatsnew
Adding 4.1 whatsnew

mhvk/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,saimn/astropy,larrybradley/astropy,dhomeier/astropy,saimn/astropy,mhvk/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,pllim/astropy,StuartLittlefair/astropy,larrybradley/astropy,lpsinger/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,pllim/astropy,pllim/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,mhvk/astropy,larrybradley/astropy,pllim/astropy,dhomeier/astropy,larrybradley/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,mhvk/astropy,astropy/astropy,saimn/astropy,StuartLittlefair/astropy,astropy/astropy,astropy/astropy,saimn/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy