Changing tested python version from 3.5 to 3.6 in appveyor
Changing tested python version from 3.5 to 3.6 in appveyor

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