Improving visvalingam performance by 3x.

[avilchess]

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Tests

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[codecov[bot]]

Codecov Report

Merging #134 into master will decrease coverage by 0.28%. The diff coverage is 97.43%.

@@            Coverage Diff             @@
##           master     #134      +/-   ##
==========================================
- Coverage    97.6%   97.31%   -0.29%     
==========================================
  Files          17       17              
  Lines        1879     1901      +22     
==========================================
+ Hits         1834     1850      +16     
- Misses         45       51       +6

Impacted Files	Coverage Δ
src/khiva/dimensionality.cpp	96.97% <97.43%> (-1.73%)	:arrow_down:

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[jrecuerda]

LGTM