Update min version for six to 1.10.0 [ci skip]
Update min version for six to 1.10.0 [ci skip]

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