Add `Settings` field `NonWorkingDays`

[codecov-commenter]

Codecov Report

Merging #77 (bafdf24) into master (6c5eb72) will decrease coverage by 0.07%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   76.01%   75.94%   -0.08%     
==========================================
  Files           8        8              
  Lines        2410     2419       +9     
==========================================
+ Hits         1832     1837       +5     
- Misses        340      342       +2     
- Partials      238      240       +2     

Impacted Files	Coverage Δ
types.go	70.37% <ø> (ø)
client.go	70.76% <0.00%> (-0.08%)	:arrow_down:
request.go	81.81% <0.00%> (ø)

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