Update posts/2019-05-14-Rust-1.34.2.md

Co-Authored-By: Jonas Schievink <[email protected]>

Author: pietroalbini

posts/2019-05-14-Rust-1.34.2.md

@@ -39,7 +39,7 @@ will be discussed in [issue #60784][60784].
 An in-depth explaination of this issue was posted in yesterday's [security
 advisory][ml]. The assigned CVE for the vulnerability is [CVE-2019-12083][cve].
 
-[ml]: https://groups.google.com/forum/#!topic/rustlang-security-announcements/aZabeCMUv70
+[ml]: https://groups.google.com/d/msg/rustlang-security-announcements/aZabeCMUv70/-2Y6-SL6AQAJ
 [Error::downcast]: https://doc.rust-lang.org/stable/std/error/trait.Error.html#method.downcast
 [Error::type_id]: https://doc.rust-lang.org/stable/std/error/trait.Error.html#method.type_id
 [TypeId]: https://doc.rust-lang.org/stable/std/any/struct.TypeId.html