add Parallelization

[QuayAu]

[codecov[bot]]

Codecov Report

Merging #4 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #4   +/-   ##
=======================================
  Coverage   80.93%   80.93%           
=======================================
  Files          11       11           
  Lines         451      451           
=======================================
  Hits          365      365           
  Misses         86       86

Impacted Files	Coverage Δ
R/featureImportance.R	97.05% <100%> (ø)	:arrow_up:

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