I don't. My blog has one, but the hand-rolled static site generator I use for the book doesn't do that. It's pretty minimal.

My impression (for better or worse) is that few people use RSS these days, so it didn't seem like a great use of my time to get it set up.

If you don't want to join the mailing list for whatever reason (though it is quite low traffic), you could follow me on twitter too (@munificentbob). I tweet whenever a new chapter is up.