Fix link to Zulip page (#404)

Author: nazar-pc

src/libs/README.md

@@ -6,7 +6,7 @@ This section documents meta processes by the Libs team.
 
 The libs team hangs out primarily in [the rust-lang Zulip](https://rust-lang.zulipchat.com/) these days in the `#t-libs` stream.
 
-You can also find out more details about [Zulip and how the Rust community uses it](../../chat/zulip.html).
+You can also find out more details about [Zulip and how the Rust community uses it](../../platforms/zulip.html).
 
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