feat: support manual version updates

[kt3k]

closes #9

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 82.14286% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 83.26%. Comparing base (ac20c5c) to head (dabeb67).

Files	Patch %	Lines
util.ts	78.26%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
+ Coverage   83.09%   83.26%   +0.16%     
==========================================
  Files           2        2              
  Lines         426      478      +52     
  Branches       56       66      +10     
==========================================
+ Hits          354      398      +44     
- Misses         72       80       +8     

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