adding PR to changelog
adding PR to changelog

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