Update README.md

Signed-off-by: Raileen Del Rosario <43893067+raileendr@users.noreply.github.com>

Author: raileendr

README.md

@@ -3,7 +3,7 @@
 This reference implementation models the use case of taking an agreement PDF sent by the Docusign platform using a file archive extension app and storing it locally.
 
 ## Video Walkthrough
-[![Reference implementation videos](https://img.youtube.com/vi/_4p7GWK5aoA/0.jpg)](https://youtube.com/playlist?list=PLXpRTgmbu4orBQrYWPAXa4EBXv0IGGzID&feature=shared)
+[![Reference implementation videos](https://img.youtube.com/vi/_4p7GWK5aoA/0.jpg)](https://youtube.com/playlist?list=PLXpRTgmbu4oq4VDLJBA2BO6psxf8vkVoq&feature=shared)
 
 ## Setup instructions
 ### 1. Clone the repository