Add change log section for 4.1.1 [skip travis]
Add change log section for 4.1.1 [skip travis]

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