Fix reference in CHANGES.rst
Fix reference in CHANGES.rst

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