docs: update README.rst

[eltociear]

supporitng -> supporting

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.74%. Comparing base (2135270) to head (acf0a99).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #639   +/-   ##
=======================================
  Coverage   87.74%   87.74%           
=======================================
  Files         112      112           
  Lines       10605    10605           
  Branches     1431     1431           
=======================================
  Hits         9305     9305           
  Misses        946      946           
  Partials      354      354           

Flag	Coverage Δ
datachain	87.68% <ø> (ø)

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[shcheklein]

thanks @eltociear !