Update README.md

[jmafoster1]

Added an installation note in response to a reviewer comment for the JOSS submission. See JOSS issue.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	36		0	0.96s
✅ PYTHON	pylint	36		0	5.78s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.02%. Comparing base (cbf000a) to head (88fef70).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #306   +/-   ##
=======================================
  Coverage   97.02%   97.02%           
=======================================
  Files          29       29           
  Lines        1849     1849           
=======================================
  Hits         1794     1794           
  Misses         55       55           

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[f-allian]

@jmafoster1 Thanks for this Michael.