# 0.4.0 (October 15, 2020)
### Added
- sync: `CancellationToken` for coordinating task cancellation (#2747).
- rt: `TokioContext` sets the Tokio runtime for the duration of a future (#2791)
- io: `StreamReader`/`ReaderStream` map between `AsyncRead` values and `Stream`
of bytes (#2788).
- time: `DelayQueue` to manage many delays (#2897).
# 0.3.1 (March 18, 2020)
### Fixed
- Adjust minimum-supported Tokio version to v0.2.5 to account for an internal
dependency on features in that version of Tokio. ([#2326])
# 0.3.0 (March 4, 2020)
### Changed
- **Breaking Change**: Change `Encoder` trait to take a generic `Item` parameter, which allows
codec writers to pass references into `Framed` and `FramedWrite` types. ([#1746])
### Added
- Add futures-io/tokio::io compatibility layer. ([#2117])
- Add `Framed::with_capacity`. ([#2215])
### Fixed
- Use advance over split_to when data is not needed. ([#2198])
# 0.2.0 (November 26, 2019)
- Initial release
[#2326]: https://github.com/tokio-rs/tokio/pull/2326
[#2215]: https://github.com/tokio-rs/tokio/pull/2215
[#2198]: https://github.com/tokio-rs/tokio/pull/2198
[#2117]: https://github.com/tokio-rs/tokio/pull/2117
[#1746]: https://github.com/tokio-rs/tokio/pull/1746