Rename z77z into maggesi

Make the "handle" of the maintainer match the name of the github account.
Also update the email address.

pkgs/development/ocaml-modules/odn/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation {
     license = licenses.lgpl21;
     platforms = ocaml.meta.platforms or [];
     maintainers = with maintainers; [
-      vbgl z77z
+      vbgl maggesi
     ];
   };
 }