fix: correct flag name regex, remove x- from some headers

[drazisil-codecov]

• fix: correct flag name regex
• remove x- from some headers
• refactor exit logic for improved testing
• update several dependencies

[codecov]

Codecov Report

Merging #160 (e1fb76a) into release (b71ea21) will increase coverage by 0.60%.
The diff coverage is 67.74%.

@@             Coverage Diff             @@
##           release     #160      +/-   ##
===========================================
+ Coverage    91.57%   92.17%   +0.60%     
===========================================
  Files           15       15              
  Lines          546      537       -9     
  Branches       105      101       -4     
===========================================
- Hits           500      495       -5     
+ Misses          20       16       -4     
  Partials        26       26              

Flag	Coverage Δ
alpine	92.17% <67.74%> (+0.60%)	⬆️
linux	92.17% <67.74%> (+0.60%)	⬆️
linux-without-git	∅ <ø> (∅)
macos	92.17% <67.74%> (+0.60%)	⬆️
macos-without-git	∅ <ø> (∅)
windows	91.62% <67.74%> (+0.59%)	⬆️
windows-without-git	∅ <ø> (∅)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/helpers/web.js	85.29% <ø> (ø)
src/index.js	75.30% <67.21%> (+1.97%)	⬆️
src/helpers/validate.js	100.00% <100.00%> (ø)

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