drop unneeded changelog entry
drop unneeded changelog entry

this feature is new in 3.1 anyway...

pllim/astropy,mhvk/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,MSeifert04/astropy,dhomeier/astropy,astropy/astropy,StuartLittlefair/astropy,stargaser/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,mhvk/astropy,bsipocz/astropy,astropy/astropy,bsipocz/astropy,stargaser/astropy,dhomeier/astropy,astropy/astropy,stargaser/astropy,StuartLittlefair/astropy,larrybradley/astropy,dhomeier/astropy,dhomeier/astropy,lpsinger/astropy,lpsinger/astropy,saimn/astropy,StuartLittlefair/astropy,pllim/astropy,aleksandr-bakanov/astropy,saimn/astropy,MSeifert04/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,astropy/astropy,larrybradley/astropy,StuartLittlefair/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,larrybradley/astropy,stargaser/astropy,pllim/astropy,larrybradley/astropy,astropy/astropy,MSeifert04/astropy,saimn/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,saimn/astropy