Rename Mutual Info

[ctduffy]

• Renames get_mutual_information mutual_information
• Closes Rename get_mutual_information to mutual_information #313

[ctduffy]

@gsheni Really confused why my unit tests are failing. It seems unrelated to my PR, but also the main branch doesn't seem to have these failures...

[thehomebrewnerd]

@gsheni Really confused why my unit tests are failing. It seems unrelated to my PR, but also the main branch doesn't seem to have these failures...

@ctduffy The latest release of Koalas broke a lot of things. I'm working on fixing now, but until my fix is merged in, the tests will continue to fail - unless you restrict the Koalas version to be <=1.3.0.

[codecov]

Codecov Report

Merging #390 (5a5af94) into main (5d91521) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #390   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines         3781      3781           
=========================================
  Hits          3781      3781           

Impacted Files	Coverage Δ
woodwork/datatable.py	100.00% <100.00%> (ø)
woodwork/tests/datatable/test_datatable.py	100.00% <100.00%> (ø)

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[gsheni]

lgtm. Just 1 minor thing.