rsstail: add Necior to maintainers

pkgs/applications/networking/feedreaders/rsstail/default.nix

···
     '';
     homepage = "http://www.vanheusden.com/rsstail/";
     license = licenses.gpl2Plus;
+    maintainers = [ maintainers.Necior ];
     platforms = platforms.unix;
   };
 }