Add support for minor release

[blink1073]

Fixes #244. Also changes the way .dev versions are handled by "next" - we drop the .dev suffix and release a final version. This had bitten us recently in jupyter_server.

[codecov-commenter]

Codecov Report

Merging #256 (f15f7a7) into main (0082d05) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
+ Coverage   85.10%   85.12%   +0.02%     
==========================================
  Files          19       19              
  Lines        2349     2353       +4     
  Branches      303      304       +1     
==========================================
+ Hits         1999     2003       +4     
  Misses        252      252              
  Partials       98       98              

Impacted Files	Coverage Δ
jupyter_releaser/tests/test_functions.py	98.65% <100.00%> (+0.01%)	⬆️
jupyter_releaser/util.py	73.80% <100.00%> (+0.25%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0082d05...f15f7a7. Read the comment docs.