Add v2.0 to changelog
Add v2.0 to changelog

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