update README to mention dashboard
update README to mention dashboard

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