lsix: add maintainer justinlime

pkgs/tools/graphics/lsix/default.nix

···
     homepage = "https://github.com/hackerb9/lsix";
     license = licenses.gpl3Only;
     platforms = platforms.all;
-    maintainers = with maintainers; [ kidonng ];
+    maintainers = with maintainers; [ justinlime kidonng ];
     mainProgram = "lsix";
   };
 })