[Pkg-mailman-hackers] mailman3 is marked for autoremoval from testing

[Debian testing autoremoval watch]

mailman3 3.2.2-1 is marked for autoremoval from testing on 2019-09-30

It (build-)depends on packages with these RC bugs:
934960: python-mock, src:pytest-mock: python-mock breaks pytest-mock autopkgtest