Disabled AppVeyor cache
Disabled AppVeyor cache

in hopes of improving reliability (#1176)

juhp/stack,mrkkrp/stack,Blaisorblade/stack,mathhun/stack,Heather/stack,narrative/stack,Fuuzetsu/stack,Blaisorblade/stack,luigy/stack,martin-kolinek/stack,mathhun/stack,sjakobi/stack,rubik/stack,sjakobi/stack,vigoo/stack,achernyak/stack,MichielDerhaeg/stack,narrative/stack,phadej/stack,rvion/stack,keent/stack,AndrewRademacher/stack,luigy/stack,vigoo/stack,mrkkrp/stack,Fuuzetsu/stack,martin-kolinek/stack,keent/stack,MichielDerhaeg/stack,achernyak/stack,Heather/stack,rvion/stack,harendra-kumar/stack,harendra-kumar/stack,AndrewRademacher/stack,rubik/stack,juhp/stack,deech/stack,phadej/stack,anton-dessiatov/stack,AndreasPK/stack,anton-dessiatov/stack,AndreasPK/stack,deech/stack