hackage2nix: add older versions of parallel and vector to the package set
hackage2nix: add older versions of parallel and vector to the package set

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