CRAN candidate

[mayer79]

This PR

• adds Przemek as contributor,
• changes David Watson from contributor to author. He added parallel implementation, and even more important the ingrediences to handle the exact case efficiently
• prevents verbose = FALSE to hide warnings

As such, it is the next CRAN candidate

[codecov-commenter]

Codecov Report

Merging #83 (842c6fa) into main (edcbd02) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 842c6fa differs from pull request most recent head 45d0308. Consider uploading reports for the commit 45d0308 to get more accurate results

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@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   93.64%   93.64%           
=======================================
  Files           5        5           
  Lines         346      346           
=======================================
  Hits          324      324           
  Misses         22       22           

Impacted Files	Coverage Δ
R/kernelshap.R	99.05% <100.00%> (ø)

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[mayer79]

Accepted