Adress get_cmap Deprecation

[TheSkyentist]

Fixes deprecation of cm.get_cmap since matplotlib 3.7. This will no longer work in latest versions of matplotlib and should maintain compatibility with older versions.

[ryanhausen]

@TheSkyentist Thanks!

It looks like there are some CI issues.

The lint is odd because it's a file you didn't change, so I think that perhaps the formatter I use has made some changes since I last ran the CI. Would you mind running the black formatter and then committing the changes?

The OSX build issue I will take care of.

Then the CI will pass and I can merge. Thanks again!

[TheSkyentist]

Done!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.46%. Comparing base (a7e2119) to head (23bb5fb).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   90.73%   90.46%   -0.27%     
==========================================
  Files           5        5              
  Lines         745      745              
==========================================
- Hits          676      674       -2     
- Misses         69       71       +2     

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[ryanhausen]

Had to move osx-latest to python 3.8, will override python 3.7 action as it will never pass