Fix default branch handling and update UX

[blink1073]

No description provided.

[codecov-commenter]

Codecov Report

Merging #224 (ed59510) into master (1916eee) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #224   +/-   ##
=======================================
  Coverage   85.11%   85.11%           
=======================================
  Files          19       19           
  Lines        2304     2304           
  Branches      290      290           
=======================================
  Hits         1961     1961           
  Misses        247      247           
  Partials       96       96           

Impacted Files	Coverage Δ
jupyter_releaser/actions/draft_changelog.py	0.00% <0.00%> (ø)
jupyter_releaser/actions/draft_release.py	0.00% <0.00%> (ø)

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