persepolis: add iFreilicht as a maintainer

pkgs/tools/networking/persepolis/default.nix

···
     description = "Persepolis Download Manager is a GUI for aria2";
     homepage = "https://persepolisdm.github.io/";
     license = licenses.gpl3;
-    maintainers = [ ];
+    maintainers = with maintainers; [ iFreilicht ];
   };
 }