mlmmj: add docfiles to output

pkgs/servers/mail/mlmmj/default.nix

@@ -10,6 +10,12 @@ stdenv.mkDerivation rec {
     sha256 = "18n7b41nfdj7acvmqzkkz984d26xvz14xk8kmrnzv23dkda364m0";
   };
 
+  postInstall = ''
+    # grab all documentation files
+    docfiles=$(find -maxdepth 1 -name "[[:upper:]][[:upper:]]*")
+    install -vDm 644 -t $out/share/doc/mlmmj/ $docfiles
+  '';
+
   meta = with stdenv.lib; {
     homepage = http://mlmmj.org;
     description = "Mailing List Management Made Joyful";
@@ -18,4 +24,4 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
   };
 
-}
+}