Make getLevelConfig a pure function

[olistic]

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[codecov-io]

Codecov Report

Merging #234 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
+ Coverage   92.64%   92.65%   +<.01%     
==========================================
  Files          92       92              
  Lines        1088     1089       +1     
  Branches      165      165              
==========================================
+ Hits         1008     1009       +1     
  Misses         65       65              
  Partials       15       15

Impacted Files	Coverage Δ
...ges/warriorjs-helper-get-level-config/src/index.js	100% <100%> (ø)	⬆️

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