Use spaces not tabs in README code block

[FollowTheProcess]

Summary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.60%. Comparing base (d8548d8) to head (3bdaa47).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   92.60%   92.60%           
=======================================
  Files           7        7           
  Lines        1028     1028           
=======================================
  Hits          952      952           
  Misses         44       44           
  Partials       32       32           

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