Add scans

[tkf]

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[codecov]

Codecov Report

Merging #43 (d75cbda) into master (e22ddea) will increase coverage by 0.16%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   82.25%   82.41%   +0.16%     
==========================================
  Files           7        8       +1     
  Lines         355      381      +26     
==========================================
+ Hits          292      314      +22     
- Misses         63       67       +4     

Flag	Coverage Δ
unittests	82.41% <84.61%> (+0.16%)	⬆️

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Impacted Files	Coverage Δ
src/Folds.jl	100.00% <ø> (ø)
src/testing.jl	88.61% <ø> (ø)
src/scan.jl	84.61% <84.61%> (ø)

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