doc: Adopters list in README

[mmcloughlin]

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[codecov-commenter]

Codecov Report

Merging #252 (6d48586) into master (956d98e) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

❗ Current head 6d48586 differs from pull request most recent head 1425b52. Consider uploading reports for the commit 1425b52 to get more accurate results

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
- Coverage   76.12%   76.07%   -0.06%     
==========================================
  Files          65       65              
  Lines       20538    20552      +14     
==========================================
  Hits        15634    15634              
- Misses       4825     4839      +14     
  Partials       79       79              

Flag	Coverage Δ
integration	11.84% <ø> (ø)
unittests	73.17% <0.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/thirdparty/config.go	81.48% <0.00%> (-7.71%)	⬇️

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