fix: error exit code.

[knightedcodemonkey]

• closes #36
• updates ci deps

[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (79945f7) 96.59% compared to head (daa903e) 96.46%.

Files	Patch %	Lines
src/duel.js	76.92%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #37 +/- ## ========================================== - Coverage 96.59% 96.46% -0.14% ========================================== Files 3 3 Lines 441 453 +12 ========================================== + Hits 426 437 +11 - Misses 15 16 +1 ```

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