feat: add none pr check

[janos-kasa]

This PR allows adding a none option to PR checks enabling the usage of this package to disallow merging if a label is set on a PR.

Please let me know if you need any changes from me!

[codecov]

Codecov Report

Merging #114 (e7fabec) into main (3386cbc) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #114   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          238       241    +3     
  Branches        77        79    +2     
=========================================
+ Hits           238       241    +3     

Impacted Files	Coverage Δ
src/config.ts	100.00% <ø> (ø)
src/checks.ts	100.00% <100.00%> (ø)

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[fuxingloh]

thanks, I added 1 more test and generated the dist

[janos-kasa]

Thanks @fuxingloh!