update README.md

[jGaboardi]

This PR adds links to maintainers GitHub profiles in README.

[codecov]

Codecov Report

Merging #306 (e560425) into main (9c1e05e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #306   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files          13       13           
  Lines        2794     2794           
=======================================
  Hits         2674     2674           
  Misses        120      120           

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[martinfleis]

Thanks!