Comment 1 for bug 1820982

This is a bit special as nose was already in main for quite some time.
It was in main up until (including) Xenial especially since back in the day build-dependencies needed to be in main as well.

It was dropped since then but had passed all the checks in the past already.

My intention initially was to cut the dependency from lazr.delegates but for now was convinced otherwise.
Therefore as discussed in yesterday's MIR team meeting [1] we are ok to - re-promote the package.

[1]: https://irclogs.ubuntu.com/2019/03/19/%23ubuntu-meeting.html#t14:12

P.S. I'll still suggest to Debian to remove the nose dep, so hopefully down he road it can be demoted again.