Suppress warnings

[kennethshsu]

• Fixed [MAINT] Pandas deprecation notices #510
• And warnings from nans: Warning issued in correlation tests genedan/cl-practitioners-guide#9

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.61%. Comparing base (cb9747b) to head (6dee2e5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
+ Coverage   80.60%   80.61%   +0.01%     
==========================================
  Files          80       80              
  Lines        4733     4736       +3     
  Branches      809      810       +1     
==========================================
+ Hits         3815     3818       +3     
  Misses        641      641              
  Partials      277      277              

Flag	Coverage Δ
unittests	80.61% <100.00%> (+0.01%)	⬆️

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