hackage2nix: use current versions of QuickCheck by default
hackage2nix: use current versions of QuickCheck by default

gridaphobe/cabal2nix,dmalikov/cabal2nix,psibi/cabal2nix,jb55/cabal2nix,spencerjanssen/cabal2nix,Fuuzetsu/cabal2nix,bennofs/cabal2nix