Merge pull request rms-open-letter#1838 from arnobroekhof/main

Update index.md added signature

Author: neilmcgovern

index.md

@@ -254,6 +254,7 @@ identification purposes only and does not constitute endorsement.)</small>
 1. Ariela Wenner
 1. Arne Brasseur
 1. Arne Visscher
+1. Arno Broekhof
 1. Arno Fleming (Community organiser)
 1. Artemis Tosini (NixOS contributor)
 1. Arthur Richards