For a 0.20.12 release

[ablaom]

#806

[codecov-commenter]

Codecov Report

Merging #808 (ed601bd) into master (ab8d12c) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #808      +/-   ##
==========================================
+ Coverage   85.61%   85.70%   +0.08%     
==========================================
  Files          36       36              
  Lines        3477     3497      +20     
==========================================
+ Hits         2977     2997      +20     
  Misses        500      500              

Impacted Files	Coverage Δ
src/composition/learning_networks/machines.jl	92.00% <100.00%> (+0.16%)	⬆️
src/composition/models/inspection.jl	100.00% <100.00%> (ø)
src/composition/models/methods.jl	100.00% <100.00%> (ø)
src/composition/models/pipelines.jl	99.41% <100.00%> (ø)
src/composition/models/transformed_target_model.jl	100.00% <100.00%> (ø)
src/machines.jl	87.32% <100.00%> (ø)
src/operations.jl	88.37% <100.00%> (+4.50%)	⬆️

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