changes for #209

[topepo]

added nnet engine for multinom_reg()

[codecov-io]

Codecov Report

Merging #242 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
- Coverage   70.79%   70.77%   -0.03%     
==========================================
  Files          38       38              
  Lines        2996     2997       +1     
==========================================
  Hits         2121     2121              
- Misses        875      876       +1

Impacted Files	Coverage Δ
R/misc.R	41.66% <ø> (ø)	⬆️
R/multinom_reg.R	31.53% <0%> (-0.29%)	⬇️

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[github-actions]

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