feat: improve cli documentation when using the --help flag

[ga-paul-t]

closes #129

[codecov-commenter]

Codecov Report

Merging #303 (29b3d0b) into main (624cf49) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
+ Coverage   83.29%   83.32%   +0.03%     
==========================================
  Files          43       43              
  Lines        2185     2189       +4     
==========================================
+ Hits         1820     1824       +4     
  Misses        290      290              
  Partials       75       75              

Impacted Files	Coverage Δ
cmd/uplift/bump.go	83.11% <100.00%> (+0.22%)	⬆️
cmd/uplift/changelog.go	86.32% <100.00%> (+0.11%)	⬆️
cmd/uplift/release.go	85.03% <100.00%> (+0.23%)	⬆️
cmd/uplift/tag.go	84.14% <100.00%> (ø)

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