update README
update README

Protoss78/flag-icon,stevenrskelton/flag-icon,jhnklly/flag-icon,Protoss78/flag-icon,GPQuery/livery-icon-flags,jhnklly/flag-icon,stevenrskelton/flag-icon,curtisgibby/flag-icon,GPQuery/livery-flags,curtisgibby/flag-icon