fix dcorr sqrt bug

[sampan501]

Reference issue

Closes #384

Type of change

Bug

What does this implement/fix?

Takes square root of Dcorr test statistic and fixes fast Dcorr so statistic is calculated as before.

Additional information

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (50f9c68) 96.70% compared to head (fa377e5) 96.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #385   +/-   ##
=======================================
  Coverage   96.70%   96.71%           
=======================================
  Files          86       86           
  Lines        3886     3891    +5     
=======================================
+ Hits         3758     3763    +5     
  Misses        128      128           

Impacted Files	Coverage Δ
hyppo/independence/tests/test_kmerf.py	87.50% <ø> (ø)
hyppo/independence/tests/test_maxmargin.py	100.00% <ø> (ø)
hyppo/independence/dcorr.py	97.67% <100.00%> (ø)
hyppo/independence/tests/test_dcorr.py	100.00% <100.00%> (ø)
hyppo/ksample/tests/test_ksamp.py	100.00% <100.00%> (ø)
hyppo/tools/common.py	94.17% <100.00%> (ø)

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