Add Holden Karau (Apache Spark)

Author: holdenk

index.md

@@ -773,6 +773,7 @@ identification purposes only and does not constitute endorsement.)</small>
 1. Hidde Beydals
 1. Highlander Subaron (`HightechSec`)
 1. Hisham Muhammad (htop, LuaRocks, GoboLinux)
+1. Holden Karau (Apache Spark PMC)
 1. Holger Levsen (Debian Developer, reproducible-builds.org)
 1. Honza Král
 1. Horst Gutmann