Change is in the air! Untyped zero, coroutines, and improved http.ServeMux.

Go 1.21RC3 released 🎉 loopvar fix has been ACCEPTED! Likely to be included in 1.22 Blog post: Coroutines for Go by Russ Cox 🌐 net/http.serveMux routing improvements is now an official proposal 0️⃣ New proposal: add an untyped zero Echo 4.11.0 released Join us on Slack at #cup-o-go on the Gophers Slack, and  buy your own Cup o' Go Merch 🛍️!