remove isort warning for -rc

[chinskiy]

https://pycqa.github.io/isort/docs/upgrade_guides/5.0.0.html

Prior to version 5.0.0, isort wouldn't automatically traverse directories. The --recursive option was necessary to tell it to do so. In 5.0.0 directories are automatically traversed for all Python files, and as such this option is no longer necessary and should simply be removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.02%. Comparing base (a174550) to head (fdf3c6e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #86   +/-   ##
=======================================
  Coverage   85.02%   85.02%           
=======================================
  Files           8        8           
  Lines         207      207           
=======================================
  Hits          176      176           
  Misses         31       31           

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