osdlyrics: add pedrohlc to maintainers

pkgs/applications/audio/osdlyrics/default.nix

···
     description = "Standalone lyrics fetcher/displayer";
     homepage = "https://github.com/osdlyrics/osdlyrics";
     license = licenses.gpl3Plus;
-    maintainers = with maintainers; [];
+    maintainers = with maintainers; [ pedrohlc ];
     platforms = platforms.linux;
   };
 }