Bug#950481: src:doit: Tests fail on Python 3.8

[Stefano Rivera]

Package: src:doit
Version: 0.31.1-3.1
Severity: normal
Tags: upstream patch

Tests fail under Python 3.8
https://github.com/pydoit/doit/issues/341

I filed this PR upstream, and intend to upload it to Debian:
https://github.com/pydoit/doit/pull/350

SR