Replace shuffle algorithm for WeightedShuffle()

[codecov[bot]]

Codecov Report

Merging #80 into master will increase coverage by 0.14%. The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   94.54%   94.69%   +0.14%     
==========================================
  Files          23       23              
  Lines         880      886       +6     
==========================================
+ Hits          832      839       +7     
+ Misses         35       34       -1     
  Partials       13       13

Impacted Files	Coverage Δ
yrand/weight.go	86.66% <87.5%> (+3.33%)	:arrow_up:

[codeclimate[bot]]

Code Climate has analyzed commit ce3d3fe3 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 96.0% (0.2% change).

View more on Code Climate.