stack.cabal: fix maintainer e-mail address
stack.cabal: fix maintainer e-mail address

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