update playlist

Author: asottile

README.md

@@ -637,3 +637,4 @@ the full [playlist] is on youtube
 1. [a cpython release went backwards?](https://youtu.be/KyIUJFYmN-8)
 1. [why is there this weird semicolon ???](https://youtu.be/Ikke2Sg-nW4)
 1. [why do .pth files run twice? (and fixing it!)](https://youtu.be/X9IYhsNUIe8)
+1. [annotated tags](https://youtu.be/GhWbJHdCkOA)