README: let people know they don't need to subscribe
README: let people know they don't need to subscribe

People are afraid to CC the mailing list because they think they need to
subscribe (and a lot of them are already subscribed to too many lists).

lpereira/kmod,Distrotech/kmod,Distrotech/kmod,lucasdemarchi/kmod,pmmccorm/kmod,pmmccorm/kmod,Distrotech/kmod,pmmccorm/kmod,lpereira/kmod,lucasdemarchi/kmod,lpereira/kmod,lucasdemarchi/kmod