README: remove mknod from TODO list
README: remove mknod from TODO list

kwantam/coreutils,keunwoo/coreutils,Arcterus/coreutils,wimh/coreutils,keunwoo/coreutils,tempbottle/coreutils,Heather/coreutils,kevgeniy/coreutils,jbcrail/coreutils,uutils/coreutils,kevgeniy/coreutils,uutils/coreutils,wimh/coreutils,ebfe/coreutils,uutils/coreutils,Arcterus/coreutils,jbcrail/coreutils,Heather/coreutils,kwantam/coreutils,ebfe/coreutils,tempbottle/coreutils