Update README.md release version

[sjberman]

Updating a missed version string in the release branch.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.82%. Comparing base (283a218) to head (f8b5d3b).
Report is 1 commits behind head on release-2.0.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-2.0    #3599   +/-   ##
============================================
  Coverage        86.81%   86.82%           
============================================
  Files              127      127           
  Lines            15127    15127           
  Branches            62       62           
============================================
+ Hits             13133    13134    +1     
  Misses            1840     1840           
+ Partials           154      153    -1     

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