Update CONTRIBUTORS.md

[Kikass-crypto]

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[codecov-io]

Codecov Report

Merging #25 into master will increase coverage by 8.66%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #25      +/-   ##
=========================================
+ Coverage   70.13%   78.8%   +8.66%     
=========================================
  Files           5       5              
  Lines         683     684       +1     
  Branches      137       0     -137     
=========================================
+ Hits          479     539      +60     
- Misses        143     145       +2     
+ Partials       61       0      -61

Impacted Files	Coverage Δ
src/misc.c	44.44% <0%> (+7.4%)	⬆️
src/dataset.c	80.31% <0%> (+7.87%)	⬆️
src/io.c	87.38% <0%> (+15.31%)	⬆️
src/operations.c	77.2% <0%> (+16.46%)	⬆️

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