hackage2nix.hs: don't switch utf8-string to version 1.x yet
hackage2nix.hs: don't switch utf8-string to version 1.x yet

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