fix pypi version tag in docs

[dennisbader]

Checklist before merging this PR:

• Mentioned all issues that this PR fixes or addresses.
• Summarized the updates of this PR under Summary.
• Added an entry under Unreleased in the Changelog.

Fixes latest PyPI version tags in documentation README and documentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.72%. Comparing base (e803ef6) to head (d86666d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3064      +/-   ##
==========================================
- Coverage   95.79%   95.72%   -0.07%     
==========================================
  Files         158      158              
  Lines       17293    17293              
==========================================
- Hits        16565    16554      -11     
- Misses        728      739      +11     

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