Add Folds.foreach

[tkf]

tkf/Referenceables.jl#10

[codecov]

Codecov Report

Merging #29 (100f137) into master (8aaf92a) will increase coverage by 0.53%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   80.75%   81.29%   +0.53%     
==========================================
  Files           5        5              
  Lines         291      310      +19     
==========================================
+ Hits          235      252      +17     
- Misses         56       58       +2     

Flag	Coverage Δ
unittests	81.29% <89.47%> (+0.53%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/reduce.jl	88.88% <89.47%> (+0.13%)	⬆️

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