Bucket::new() returns now a Result instead of Option

[manuelpelloni]

Closes #29

[codecov]

Codecov Report

Merging #34 (113cf30) into main (adaf065) will decrease coverage by 0.16%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
- Coverage   91.84%   91.67%   -0.17%     
==========================================
  Files          26       26              
  Lines        1250     1261      +11     
==========================================
+ Hits         1148     1156       +8     
- Misses        102      105       +3     

Impacted Files	Coverage Δ
src/bucket.rs	95.93% <76.47%> (-2.28%)	⬇️

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[guerinoni]

LGTM