Update README.rst

[lheagy]

update installation instructions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.93%. Comparing base (27a37a5) to head (f5a0538).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #82   +/-   ##
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  Coverage   85.93%   85.93%           
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  Files          31       31           
  Lines        3149     3149           
=======================================
  Hits         2706     2706           
  Misses        443      443           

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[jcapriot]

We can also add instructions about installing with the optional compiled extensions modules.

The relevant command would be:

pip install . --config-settings=setup-args="-Dwith_extensions=true"

[jcapriot]

We can also add instructions about installing with the optional compiled extensions modules.

The relevant command would be:

pip install . --config-settings=setup-args="-Dwith_extensions=true"

And maybe mention that the wheel files on pypi and the version installable through conda-forge come with these extensions pre-built.

[jcapriot]

Just realizing I left this as pending...

[jcapriot]

Suggested change

	pip install -e .
	pip install .

No need to recommend an editable install to everyone.