[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 2020-05-16

It (build-)depends on packages with these RC bugs:
954604: mailman-hyperkitty: FTBFS: dh_auto_test: error: pybuild --test --test-nose2 -i python{version} -p "3.7 3.8" returned exit code 13
956871: django-sekizai: fails to migrate to testing for too long: autopkgtest regression