Missing recommendation in Exercise 7.2

[jy-gh]

The Discussion at the end of Exercise 7.2 says the following:

Writing robust decorators is often a lot harder than it looks. Recommended reading:

However, there's no recommendation. Perhaps it was omitted accidentally?

[dabeaz]

Oh yeah. Probably an error in format conversion. Let me see if I can dig that up. It's meant to be a reference to well-known blog post about "How you're writing your decorator is wrong."

[dabeaz]

Added reading reference.