Update CHANGES to include cosmology clone operation
Update CHANGES to include cosmology clone operation

* Placed in 1.0 section
* Closes #2592

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