Update changelog for new sigma_clipped_stats keywords [skip ci]
Update changelog for new sigma_clipped_stats keywords [skip ci]

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