Update README.md

The contributor listing has been updated. At the time of my initial contributions, I was not familiar with the correct process for adding contributors.

Author: ojopiyo

scripts/spo-change-retention-labels/README.md

@@ -141,7 +141,7 @@ Stop-Transcript
 | Author(s) |
 |-----------|
 | Nick Brattoli |
-| ojopiyo |
+| [Josiah Opiyo](https://github.com/ojopiyo)  |
 
 
 [!INCLUDE [DISCLAIMER](../../docfx/includes/DISCLAIMER.md)]