release: v1.3.0

[NyanKiyoshi]

• Bumps version to v1.3.0
• Adds missing development status classifier
• Removes "commits since vX.Y.Z" in README.md due to GitHub rate-limits causing the badge to frequently show errors

Changes Checklist

• The changes were tested (manually)
• The changes are tested automatically (pytest)
• The changes are optimized and clean
• The changes are documented:
  • The code is documented
  • The readme is up to date
  • The documentation (readthedocs) is up to date and tested

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.25%. Comparing base (91222c6) to head (521d311).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files           7        7           
  Lines         347      347           
  Branches       42       42           
=======================================
  Hits          334      334           
  Misses          7        7           
  Partials        6        6           

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