Add OneHotArray

[tkf]

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[codecov]

Codecov Report

Merging #15 (b4843a7) into master (dded5a2) will decrease coverage by 1.07%.
The diff coverage is 79.48%.

❗ Current head b4843a7 differs from pull request most recent head 9294587. Consider uploading reports for the commit 9294587 to get more accurate results

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   86.44%   85.37%   -1.08%     
==========================================
  Files           7        8       +1     
  Lines         214      253      +39     
==========================================
+ Hits          185      216      +31     
- Misses         29       37       +8     

Flag	Coverage Δ
unittests	85.37% <79.48%> (-1.08%)	⬇️

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Impacted Files	Coverage Δ
src/MicroCollections.jl	100.00% <ø> (ø)
src/onehot.jl	79.48% <79.48%> (ø)

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