Prefix release tags with v, remove CHANGELOG.md

[smkent]

Changelog maintenance adds burden to releases. For projects that are
small, personal, and/or where most updates are ongoing maintenance such
as dependency changes, the value is not worth the added burden.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.00%. Comparing base (54ce17f) to head (94a088d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #18   +/-   ##
=======================================
  Coverage   60.00%   60.00%           
=======================================
  Files           1        1           
  Lines           5        5           
=======================================
  Hits            3        3           
  Misses          2        2           

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