Make BucketError public.

[ryanmcgrath]

Per #56.

[codecov]

Codecov Report

Merging #57 (db63811) into main (41328a4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files          26       26           
  Lines        1307     1307           
=======================================
  Hits         1194     1194           
  Misses        113      113           

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