Fix strange namespace issues

[felixfontein]

Fix #68.

[codecov]

Codecov Report

Merging #69 (18fff83) into main (4ebec26) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   88.98%   89.19%   +0.20%     
==========================================
  Files          16       16              
  Lines        2025     2018       -7     
  Branches      531      529       -2     
==========================================
- Hits         1802     1800       -2     
+ Misses        141      137       -4     
+ Partials       82       81       -1     

Impacted Files	Coverage Δ
antsibull_changelog/plugins.py	96.82% <100.00%> (+2.43%)	⬆️

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[felixfontein]

According to #68 (comment) this works.