[docs] add stamina video link to motivation (#96)

Author: sparkiegeek

docs/motivation.md

@@ -73,5 +73,7 @@ I hope you're now all motivated and ready to jump into our {doc}`tutorial`!
 
 - [*Resiliency in Distributed Systems*](https://blog.pragmaticengineer.com/resiliency-in-distributed-systems/) takes a broader view and explains how to build resilient systems in general.
 
-- And finally, I've given a talk at PyCon US 2017 called [*Solid Snakes or: How to Take 5 Weeks of Vacation*](https://www.youtube.com/watch?v=YVuqeXyvOUc) that addresses the various aspects to take care of to... take five weeks of (uninterrupted!) vacation.
+- I gave a talk at PyCon US 2017 called [*Solid Snakes or: How to Take 5 Weeks of Vacation*](https://www.youtube.com/watch?v=YVuqeXyvOUc) that addresses the various aspects to take care of to... take five weeks of (uninterrupted!) vacation.
   This one has a stronger focus on Python and working at a smaller scale.
+
+- Finally I recorded a video on my YouTube channel which covers the motivation and use-cases of stamina [*Master Flaky Systems with Retries in Python*](https://www.youtube.com/watch?v=BxikFuvaT1Y).