[release-notes/stretch] Release notes sign-off from the security team

[Niels Thykier <niels@thykier.net>]

Hi,

There is a security team related item in the release checklist where we
need input from the you[1]:

Items are:
 * release-notes: Security Team signoff for lower supported packages

Please review the release notes and file bugs for the missing items (if
any) and let us know once this has been done.

Thanks,
~Niels

[1]:
https://wiki.debian.org/Teams/ReleaseTeam/ReleaseCheckList/StretchCheckList