### Added
- Implementation of `Copy`, `Clone`, and `Hash` traits for `Error`
([#78])
- Implementation of `ZeroizeOnDrop` gated on `zeroize` crate feature
([#80])

### Changed
- Use `doc_cfg` instead of `doc_auto_cfg` ([#83])

[#78]: #78
[#80]: #80
[#83]: #83