test: add test with Socket.IO v3

There was no update to the exchange protocol, so the current version is compatible with both socket.io-redis@5 and socket.io-redis@6. See also: https://socket.io/blog/socket-io-3-release/
socketio · Dec 29, 2020 · 009b5b8 · 009b5b8
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diff --git a/Readme.md b/Readme.md
@@ -20,6 +20,11 @@ The emitter is also available in other programming languages:
 
 It must be used in conjunction with [socket.io-redis](https://github.com/socketio/socket.io-redis/).
 
+The current version is compatible with both:
+
+- `socket.io-redis@5` (`socket.io@2`)
+- `socket.io-redis@6` (`socket.io@3`)
+
 ## Table of content
 
 - [How to use](#how-to-use)