Merge pull request #2354 from abreis/fix-uuid-link

Fix a broken link to Uuid
diff --git a/diesel/src/pg/types/mod.rs b/diesel/src/pg/types/mod.rs
index 78a8666..9a3183c 100644
--- a/diesel/src/pg/types/mod.rs
+++ b/diesel/src/pg/types/mod.rs
@@ -181,7 +181,7 @@
     ///
     /// [`ToSql`]: ../../../serialize/trait.ToSql.html
     /// [`FromSql`]: ../../../deserialize/trait.FromSql.html
-    /// [Uuid]: https://doc.rust-lang.org/uuid/uuid/struct.Uuid.html
+    /// [Uuid]: https://docs.rs/uuid/*/uuid/struct.Uuid.html
     #[derive(Debug, Clone, Copy, Default, QueryId, SqlType)]
     #[postgres(oid = "2950", array_oid = "2951")]
     pub struct Uuid;