add onehot_batch

[Roger-luo]

No description provided.

[codecov]

Codecov Report

Merging #5 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   71.77%   71.76%   -0.01%     
==========================================
  Files           6        6              
  Lines         248      255       +7     
==========================================
+ Hits          178      183       +5     
- Misses         70       72       +2

Impacted Files	Coverage Δ
src/bit_str.jl	53.12% <50%> (-0.07%)	⬇️
src/utils.jl	80% <75%> (-0.96%)	⬇️
src/reorder.jl	77.5% <0%> (+0.57%)	⬆️

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