Use capitalized words instead of all uppercase in help

[jxskiss]

No description provided.

[codecov-commenter]

Codecov Report

Merging #25 (27b1bdf) into main (e4eb835) will increase coverage by 0.66%.
Report is 7 commits behind head on main.
The diff coverage is 89.94%.

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@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   86.15%   86.81%   +0.66%     
==========================================
  Files          11       11              
  Lines        1950     2094     +144     
==========================================
+ Hits         1680     1818     +138     
- Misses        190      194       +4     
- Partials       80       82       +2     

Files Changed	Coverage Δ
completion.go	88.01% <50.00%> (-1.38%)	⬇️
usage.go	91.80% <89.01%> (+1.48%)	⬆️
flag.go	86.75% <89.74%> (+0.65%)	⬆️
cli.go	79.22% <100.00%> (ø)
command.go	91.03% <100.00%> (+1.72%)	⬆️
flag_unsafe.go	87.75% <100.00%> (+1.08%)	⬆️
option.go	100.00% <100.00%> (ø)
utils.go	88.00% <100.00%> (+1.63%)	⬆️