src/Cabal2Nix/Hackage.hs: fix hlint warning
src/Cabal2Nix/Hackage.hs: fix hlint warning

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