Edit README.md

[nathanramoscfa]

Removing "Beta" from Demo API plan name.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (c9d85ab) to head (cb2ced0).
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files           2        2           
  Lines         532      532           
  Branches       41       41           
=======================================
  Hits          527      527           
  Misses          1        1           
  Partials        4        4           

Flag	Coverage Δ
unittests	99.06% <ø> (ø)

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