Update HOWTO_PLAY, according to new makefb binary.
Update HOWTO_PLAY, according to new makefb binary.

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs