Remove the ability to set a custom VersionFunc

[FollowTheProcess]

Summary

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.70%. Comparing base (575073e) to head (19263cb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
command.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #148      +/-   ##
==========================================
- Coverage   90.78%   90.70%   -0.09%     
==========================================
  Files           6        6              
  Lines        1595     1581      -14     
==========================================
- Hits         1448     1434      -14     
  Misses        103      103              
  Partials       44       44              

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