Fix link to macros chapter

We're gonna link to nightly as this didn't make it into the corresponding stable.
rust-lang · Oct 24, 2018 · 569228a · 569228a
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commit 569228a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/RELEASES.md b/RELEASES.md
@@ -105,7 +105,7 @@ Misc
 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
 [cargo/5984]: https://github.com/rust-lang/cargo/pull/5984/
 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
-[proc-macros]: https://doc.rust-lang.org/book/2018-edition/ch19-06-macros.html
+[proc-macros]: https://doc.rust-lang.org/stable/book/2018-edition/ch19-06-macros.html
 
 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST