Add changelog entry for #511.
Add changelog entry for #511.

DougBurke/astropy,lpsinger/astropy,stargaser/astropy,funbaker/astropy,AustereCuriosity/astropy,bsipocz/astropy,MSeifert04/astropy,bsipocz/astropy,mhvk/astropy,joergdietrich/astropy,astropy/astropy,pllim/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,stargaser/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,pllim/astropy,lpsinger/astropy,bsipocz/astropy,saimn/astropy,kelle/astropy,aleksandr-bakanov/astropy,mhvk/astropy,larrybradley/astropy,AustereCuriosity/astropy,bsipocz/astropy,StuartLittlefair/astropy,astropy/astropy,DougBurke/astropy,mhvk/astropy,AustereCuriosity/astropy,pllim/astropy,stargaser/astropy,stargaser/astropy,kelle/astropy,joergdietrich/astropy,tbabej/astropy,kelle/astropy,MSeifert04/astropy,kelle/astropy,funbaker/astropy,larrybradley/astropy,joergdietrich/astropy,pllim/astropy,tbabej/astropy,mhvk/astropy,StuartLittlefair/astropy,tbabej/astropy,dhomeier/astropy,kelle/astropy,larrybradley/astropy,larrybradley/astropy,dhomeier/astropy,saimn/astropy,pllim/astropy,AustereCuriosity/astropy,lpsinger/astropy,StuartLittlefair/astropy,MSeifert04/astropy,saimn/astropy,joergdietrich/astropy,AustereCuriosity/astropy,lpsinger/astropy,astropy/astropy,mhvk/astropy,StuartLittlefair/astropy,saimn/astropy,larrybradley/astropy,tbabej/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,DougBurke/astropy,saimn/astropy,tbabej/astropy,astropy/astropy,astropy/astropy,dhomeier/astropy,dhomeier/astropy,dhomeier/astropy,funbaker/astropy,lpsinger/astropy,joergdietrich/astropy,funbaker/astropy