feat: smart exit codes

[moul]

addresses #3

[github-actions]

Expected release notes (by @moul)

features:
smart exit codes (b9fb7ba)

• I hereby acknowledge these release notes are 🥙 AWESOME 🥙

[codecov]

Codecov Report

Merging #4 into master will decrease coverage by 0.37%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   12.00%   11.62%   -0.38%     
==========================================
  Files           1        1              
  Lines         125      129       +4     
==========================================
  Hits           15       15              
- Misses        110      114       +4     

Flag	Coverage Δ
#unittests	11.62% <0.00%> (-0.38%)	⬇️

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Impacted Files	Coverage Δ
main.go	11.62% <0.00%> (-0.38%)	⬇️

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[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on GitHub release

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