change permutations so it is one sided

[sampan501]

Closes #38

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Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files          18       18           
  Lines         717      717           
=======================================
  Hits          681      681           
  Misses         36       36

Impacted Files	Coverage Δ
mgc/ksample/base.py	100% <ø> (ø)	⬆️
mgc/time_series/base.py	100% <ø> (ø)	⬆️
mgc/independence/base.py	100% <ø> (ø)	⬆️

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