Add myself to the optin sfo list

Author: vdua

hackathons/opt-6-sfo.md

@@ -79,6 +79,7 @@ If you had your hands on Operational Telemetry code or documentation in the past
 1. [@trieloff](https://github.com/trieloff)
 2. [@ramboz](https://github.com/ramboz)
 3. [@maxakuru](https://github.com/maxakuru)
+4. [@vdua](https://github.com/vdua)
 
 ### Preparation