Update badge image for Lifecycle status in README

[mimiflynn]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.03%. Comparing base (63398ee) to head (da21a3e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #791   +/-   ##
=======================================
  Coverage   74.03%   74.03%           
=======================================
  Files          16       16           
  Lines        1510     1510           
  Branches      302      302           
=======================================
  Hits         1118     1118           
  Misses        392      392           

Flag	Coverage Δ
unittests	74.03% <ø> (ø)

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