create equal sized folds for cv.kknn

[mkuehn10]

issue #14

[codecov-io]

Codecov Report

Merging #15 into master will decrease coverage by 2%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   25.93%   23.92%   -2.01%     
==========================================
  Files           4        4              
  Lines         802      769      -33     
==========================================
- Hits          208      184      -24     
+ Misses        594      585       -9

Impacted Files	Coverage Δ
R/kknn.R	21.82% <0%> (-2.96%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 36

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• 19 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-2.008%) to 23.927%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
R/kknn.R	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
R/kknn.R	19	21.83%

Totals
Change from base Build 33:	-2.008%
Covered Lines:	184
Relevant Lines:	769

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💛 - Coveralls

[mkuehn10]

Do you need me to provide anything else for this issue/pull request?