Merge pull request rms-open-letter#1 from joshsimmons/patch-1

I was too slow to add myself to etherpad, adding here

Author: ehashman

index.md

@@ -34,3 +34,5 @@ Signed,
 - Stefano Zacchiroli (Former Debian Project Leader and Former Director of the Open Source Initiative)
 
 <!-- Any additional signees should go below this comment in chronological order -->
+
+- Josh Simmons (President of the Open Source Initiative)