Added changelog entry about WCS changes
Added changelog entry about WCS changes

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