Fix handling of dev mode

[blink1073]

Fixes #472

[codecov]

Codecov Report

Base: 81.43% // Head: 82.10% // Increases project coverage by +0.66% 🎉

Coverage data is based on head (f913f2e) compared to base (ceb424c).
Patch coverage: 95.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
+ Coverage   81.43%   82.10%   +0.66%     
==========================================
  Files          20       20              
  Lines        2817     2799      -18     
  Branches      515      513       -2     
==========================================
+ Hits         2294     2298       +4     
+ Misses        392      369      -23     
- Partials      131      132       +1     

Impacted Files	Coverage Δ
jupyter_releaser/util.py	74.44% <50.00%> (+4.42%)	⬆️
jupyter_releaser/tests/test_cli.py	98.88% <100.00%> (+0.01%)	⬆️
jupyter_releaser/tests/test_functions.py	100.00% <100.00%> (+0.81%)	⬆️
jupyter_releaser/tests/util.py	99.03% <100.00%> (-0.97%)	⬇️
jupyter_releaser/changelog.py	72.72% <0.00%> (-0.70%)	⬇️

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