Merge pull request rms-open-letter#2171 from unixbigot/unixbigot

Add signature for Christopher Biggs

Author: neilmcgovern

index.md

@@ -545,6 +545,7 @@ identification purposes only and does not constitute endorsement.)</small>
 1. Christophe Moille
 1. Christophe Noisel
 1. Christopher Allan Perry
+1. Christopher Biggs (@unixbigot)
 1. Christopher Branston
 1. Christopher Davis (GNOME)
 1. Christopher Engelhard (Fedora Project contributor)