fix: include dist/utils/* files for distribution

[mirceanis]

fixes #23

[codecov-commenter]

Codecov Report

Merging #24 (45fa71f) into master (62a6d9c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #24   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files           7        7           
  Lines         243      243           
  Branches       44       44           
=======================================
  Hits          239      239           
  Misses          4        4           

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[achingbrain]

Great catch, thanks for the PR

[achingbrain]

Published in uint8arrays@2.1.8