Update README for 0.16.0

[epretti]

We plan to release 0.16.0 shortly. Once this PR is approved and merged, I will create the GitHub release and a PR to create the conda-forge release.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.48%. Comparing base (4fda9f1) to head (2f2bfe0).
⚠️ Report is 2 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
- Coverage   84.73%   84.48%   -0.26%     
==========================================
  Files           5        5              
  Lines         799      799              
==========================================
- Hits          677      675       -2     
- Misses        122      124       +2     

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