For a 0.20.6 release

[ablaom]

• (enhancement) Support mulithreaded training of learning networks. Call as in fit!(node, acceleration=CPUThreads()) (Stack cache and acceleration (rebased) #785) @olivierlabayle
• (enhancement) Create interface point for specifying acceleration mode when "exporting" a learning network as new model type, by supporting acceleration as keyword argument of return! method (Stack cache and acceleration (rebased) #785) @olivierlabayle
• (enhancement) Add acceleration and cache fields to Stack type (Stack cache and acceleration (rebased) #785) @olivierlabayle

[codecov-commenter]

Codecov Report

Merging #788 (e853d9f) into master (adb341f) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
+ Coverage   85.93%   85.97%   +0.04%     
==========================================
  Files          36       36              
  Lines        3462     3473      +11     
==========================================
+ Hits         2975     2986      +11     
  Misses        487      487              

Impacted Files	Coverage Δ
src/composition/learning_networks/machines.jl	91.95% <100.00%> (ø)
src/composition/learning_networks/nodes.jl	71.24% <100.00%> (+1.37%)	⬆️
src/composition/models/stacking.jl	94.66% <100.00%> (+0.14%)	⬆️

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