Update README to replace IRC with Discord

README.md

@@ -52,7 +52,7 @@ A: We chose the most minimal framework to convey the key Stripe calls and concep
 If you found a bug or want to suggest a new [feature/use case/sample], please [file an issue](../../issues).
 
 If you have questions, comments, or need help with code, we're here to help:
-- on [IRC via freenode](https://webchat.freenode.net/?channel=#stripe)
+- on [Discord](https://stripe.com/go/developer-chat)
 - on Twitter at [@StripeDev](https://twitter.com/StripeDev)
 - on Stack Overflow at the [stripe-payments](https://stackoverflow.com/tags/stripe-payments/info) tag
 - by [email](mailto:[email protected])