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

[Mattia Rizzolo]

It seems indeed to work, mh.  Well, I'll just merge it and we'll see if anybody reports bugs.  "Obviously", the real good way would be for some testcases to appear, sadly ubuntutools is somewhat lacking in that regard :(
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https://code.launchpad.net/~ubuntu-dev/ubuntu-dev-tools/+git/ubuntu-dev-tools/+merge/372620
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