# Version 0.7.0
- Added `tokio` feature for async input/output.
# Version 0.6.0
- Update to rust 2021.
- Better error structure using `thiserror`.
- Use `nom`'s integer parsers
# Version 0.5.1
- Don't panic if `finish` fails while dropping a `Writer`.
# Version 0.5.0
- Re-export the most common structs at crate level.
- Support heavy ion event information.
- Add proper types for energy and length units.
# Version 0.4.1
- Accept (and ignore) empty lines in input.
# Version 0.4.0
- Tweak performance.
# Version 0.3.0
- Try to ensure that the `HepMC` footer is written.
# Version 0.2.1
- Skip lines starting with `HepMC`.
# Version 0.2.0
- `into_inner` methods to retrieve underlying readers and writers.
- Changed behaviour of `Reader::new`.