docs: update features list
docs: update features list

Following the release of kernel 4.13.

tuxology/bcc,brendangregg/bcc,iovisor/bcc,mcaleavya/bcc,iovisor/bcc,mcaleavya/bcc,iovisor/bcc,mcaleavya/bcc,tuxology/bcc,tuxology/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,mcaleavya/bcc,tuxology/bcc,mcaleavya/bcc