update README since we now DO have a mailing list
update README since we now DO have a mailing list

chardi/musl,davidlazar/musl,rofl0r/musl-old,chneukirchen/musl-chris2,rofl0r/musl-old,chardi/musl,davidlazar/musl,chardi/musl,chneukirchen/musl-chris2