dtools: add jtbx to meta.maintainers

pkgs/development/tools/dtools/default.nix

···
     description = "Ancillary tools for the D programming language compiler";
     homepage = "https://github.com/dlang/tools";
     license = lib.licenses.boost;
-    maintainers = with maintainers; [ ThomasMader ];
+    maintainers = with maintainers; [ ThomasMader jtbx ];
     platforms = lib.platforms.unix;
   };
 }