Merge pull request rms-open-letter#1912 from pkgw/pkgw

index.md: add @pkgw

Author: neilmcgovern

index.md

@@ -1719,6 +1719,7 @@ identification purposes only and does not constitute endorsement.)</small>
 1. Peter Robinson (Fedora developer, former Fedora Board and Council member)
 1. Peter Stein 
 1. Peter Van Eynde
+1. Peter K. G. Williams (`@pkgw`)
 1. Petrohs
 1. Phil Dibowitz
 1. Philip Balister