Draft announcement for 10.7

["Adam D. Barratt" <adam@adam-barratt.org.uk>]

Hi,

I've just committed a draft announcement for Saturday's point release
to the publicity announcements repo.

We may not end up including the openjdk-11 updates, but I figured it
was easier to remove them from the announcement later than to try and
add them in once translation had started.

Regards,

Adam