fixup! Implement Clone for error enums

will squash this one into the appropriate commit.

Co-authored-by: Mingun <Alexander_Sergey@mail.ru>

Changelog.md

@@ -12,7 +12,7 @@
 
 ### New Features
 
-- Implement `Clone` for all error types. This required changing `Error::Io` to contain
+- [#521]: Implement `Clone` for all error types. This required changing `Error::Io` to contain
   `Arc<std::io::Error>` instead of `std::io::Error` since `std::io::Error` does not implement
   `Clone`.