change default value nb_core

[codecov[bot]]

Codecov Report

Merging #411 (6e694fb) into master (2784581) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #411   +/-   ##
=======================================
  Coverage   75.42%   75.42%           
=======================================
  Files         147      147           
  Lines        7932     7932           
=======================================
  Hits         5983     5983           
  Misses       1949     1949           

Impacted Files	Coverage Δ
src/argparse_setting.jl	0.00% <0.00%> (ø)

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