update README sshd_client_alive.* values, https://bugzilla.mindrot.org/show_bug.cgi?id=3172#c6
update README sshd_client_alive.* values, https://bugzilla.mindrot.org/show_bug.cgi?id=3172#c6

Signed-off-by: Thomas Sjögren <9ff28d1cb1d19283ed3327b40df6c7d62d8bc343@users.noreply.github.com>

konstruktoid/ansible-role-hardening