README: use 'restrict' option in authorized_keys(5) snippet.

This is shorter and more future-proof.  Quoting the manual:

    restrict

        Enable all restrictions, i.e. disable port, agent and X11
        forwarding, as well as disabling PTY allocation and execution of
        ~/.ssh/rc.  If any future restriction capabilities are added to
        authorized_keys files they will be included in this set.

Note that this won't work with Jessie's OpenSSH server.

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