Add Dan Watkins' signature

Author: OddBloke

index.md

@@ -537,6 +537,7 @@ identification purposes only and does not constitute endorsement.)</small>
 1. Dan Bornstein (@danfuzz)
 1. Dan Cross
 1. Dan "Fennix" Sim
+1. Dan Watkins (cloud-init maintainer, Ubuntu developer)
 1. Daniel A. Rodriguez (Board of Directors, the Document Foundation)
 1. Daniel Bailey
 1. Daniel 'Dobrado' Oshiro