Update FP chat invitation link

Got it from here Functional-Programming-Slack/community#34 (comment).
gcanti · Jul 22, 2021 · c0944c0 · c0944c0
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diff --git a/README.md b/README.md
@@ -72,7 +72,7 @@ Make sure to always have a single version of `fp-ts` installed in your project.
 If you need help with `fp-ts` check out:
 
 - this [Discord server](https://discord.gg/HVWmBBXM8A)
-- the `#fp-ts` channel on [FP slack](https://functionalprogramming.slack.com) .
+- the `#fp-ts` channel on [FP slack](https://fpchat-invite.herokuapp.com).
 
 # Development