Fix broken Validators table at README.md

[marcelozarate]

Fix broken Validators table at README.md

Before

After

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

[codecov]

Codecov Report

Merging #2010 (2d70100) into master (1bb14e8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2010   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          104       104           
  Lines         2203      2203           
  Branches       477       477           
=========================================
  Hits          2203      2203           

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