hevea: 2.28 -> 2.29

2.28 is no longer available at that url

pkgs/tools/typesetting/hevea/default.nix

···
 { stdenv, fetchurl, ocaml }:
 
 stdenv.mkDerivation rec {
-  name = "hevea-2.28";
+  name = "hevea-2.29";
 
   src = fetchurl {
     url = "http://pauillac.inria.fr/~maranget/hevea/distri/${name}.tar.gz";
-    sha256 = "14fns13wlnpiv9i05841kvi3cq4b9v2sw5x3ff6ziws28q701qnd";
+    sha256 = "1i7qkar6gjpsxqgdm90xxgp15z7gfyja0rn62n23a9aahc0hpgq6";
   };
 
   buildInputs = [ ocaml ];