Fix opencollective links in README

[rkravchik]

Subj

[codecov-io]

Codecov Report

Merging #1077 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1077   +/-   ##
=======================================
  Coverage   84.02%   84.02%           
=======================================
  Files          57       57           
  Lines        2924     2924           
=======================================
  Hits         2457     2457           
  Misses        390      390           
  Partials       77       77

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[caarlos0]

good catch, no idea how it got that way

thanks!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.