[Merge] ubuntu-dev-tools:py3debian-changelog into ubuntu-dev-tools:master

[Mattia Rizzolo]

please let me keep this MR for a next possible-breaking upload, keeping the next one with fixes only.
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https://code.launchpad.net/~ubuntu-dev/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/372620
Your team Ubuntu Development Team is requested to review the proposed merge of ubuntu-dev-tools:py3debian-changelog into ubuntu-dev-tools:master.