README: update for clamav
README: update for clamav

fabianfrz/plugins,dharrigan/plugins,evbevz/plugins,fabianfrz/plugins,fraenki/plugins,evbevz/plugins,fabianfrz/plugins,fraenki/plugins,fraenki/plugins,fabianfrz/plugins,fabianfrz/plugins,fabianfrz/plugins,evbevz/plugins,evbevz/plugins,evbevz/plugins,dharrigan/plugins,fraenki/plugins,dharrigan/plugins,dharrigan/plugins,fraenki/plugins,fraenki/plugins,evbevz/plugins,dharrigan/plugins,evbevz/plugins,fraenki/plugins,dharrigan/plugins,fraenki/plugins,fabianfrz/plugins