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+# 0.7.2 (May 14, 2022)
+
+This release contains a rewrite of `CancellationToken` that fixes a memory leak. ([#4652])
+
+[#4652]: https://github.com/tokio-rs/tokio/pull/4652
+
+# 0.7.1 (February 21, 2022)
+
+### Added
+
+- codec: add `length_field_type` to `LengthDelimitedCodec` builder ([#4508])
+- io: add `StreamReader::into_inner_with_chunk()` ([#4559])
+
+### Changed
+
+- switch from log to tracing ([#4539])
+
+### Fixed
+
+- sync: fix waker update condition in `CancellationToken` ([#4497])
+- bumped tokio dependency to 1.6 to satisfy minimum requirements ([#4490])
+
+[#4490]: https://github.com/tokio-rs/tokio/pull/4490
+[#4497]: https://github.com/tokio-rs/tokio/pull/4497
+[#4508]: https://github.com/tokio-rs/tokio/pull/4508
+[#4539]: https://github.com/tokio-rs/tokio/pull/4539
+[#4559]: https://github.com/tokio-rs/tokio/pull/4559
+
+# 0.7.0 (February 9, 2022)
+
+### Added
+
+- task: add `spawn_pinned` ([#3370])
+- time: add `shrink_to_fit` and `compact` methods to `DelayQueue` ([#4170])
+- codec: improve `Builder::max_frame_length` docs ([#4352])
+- codec: add mutable reference getters for codecs to pinned `Framed` ([#4372])
+- net: add generic trait to combine `UnixListener` and `TcpListener` ([#4385])
+- codec: implement `Framed::map_codec` ([#4427])
+- codec: implement `Encoder<BytesMut>` for `BytesCodec` ([#4465])
+
+### Changed
+
+- sync: add lifetime parameter to `ReusableBoxFuture` ([#3762])
+- sync: refactored `PollSender<T>` to fix a subtly broken `Sink<T>` implementation ([#4214])
+- time: remove error case from the infallible `DelayQueue::poll_elapsed` ([#4241])
+
+[#3370]: https://github.com/tokio-rs/tokio/pull/3370
+[#4170]: https://github.com/tokio-rs/tokio/pull/4170
+[#4352]: https://github.com/tokio-rs/tokio/pull/4352
+[#4372]: https://github.com/tokio-rs/tokio/pull/4372
+[#4385]: https://github.com/tokio-rs/tokio/pull/4385
+[#4427]: https://github.com/tokio-rs/tokio/pull/4427
+[#4465]: https://github.com/tokio-rs/tokio/pull/4465
+[#3762]: https://github.com/tokio-rs/tokio/pull/3762
+[#4214]: https://github.com/tokio-rs/tokio/pull/4214
+[#4241]: https://github.com/tokio-rs/tokio/pull/4241
+
+# 0.6.10 (May 14, 2021)
+
+This is a backport for the memory leak in `CancellationToken` that was originally fixed in 0.7.2. ([#4652])
+
+[#4652]: https://github.com/tokio-rs/tokio/pull/4652
+
+# 0.6.9 (October 29, 2021)
+
+### Added
+
+- codec: implement `Clone` for `LengthDelimitedCodec` ([#4089])
+- io: add `SyncIoBridge`  ([#4146])
+
+### Fixed
+
+- time: update deadline on removal in `DelayQueue` ([#4178])
+- codec: Update stream impl for Framed to return None after Err ([#4166])
+
+[#4089]: https://github.com/tokio-rs/tokio/pull/4089
+[#4146]: https://github.com/tokio-rs/tokio/pull/4146
+[#4166]: https://github.com/tokio-rs/tokio/pull/4166
+[#4178]: https://github.com/tokio-rs/tokio/pull/4178
+
+# 0.6.8 (September 3, 2021)
+
+### Added
+
+- sync: add drop guard for `CancellationToken` ([#3839])
+- compact: added `AsyncSeek` compat ([#4078])
+- time: expose `Key` used in `DelayQueue`'s `Expired` ([#4081])
+- io: add `with_capacity` to `ReaderStream` ([#4086])
+
+### Fixed
+
+- codec: remove unnecessary `doc(cfg(...))` ([#3989])
+
+[#3839]: https://github.com/tokio-rs/tokio/pull/3839
+[#4078]: https://github.com/tokio-rs/tokio/pull/4078
+[#4081]: https://github.com/tokio-rs/tokio/pull/4081
+[#4086]: https://github.com/tokio-rs/tokio/pull/4086
+[#3989]: https://github.com/tokio-rs/tokio/pull/3989
+
+# 0.6.7 (May 14, 2021)
+
+### Added
+
+- udp: make `UdpFramed` take `Borrow<UdpSocket>` ([#3451])
+- compat: implement `AsRawFd`/`AsRawHandle` for `Compat<T>` ([#3765])
+
+[#3451]: https://github.com/tokio-rs/tokio/pull/3451
+[#3765]: https://github.com/tokio-rs/tokio/pull/3765
+
+# 0.6.6 (April 12, 2021)
+
+### Added
+
+- util: makes `Framed` and `FramedStream` resumable after eof ([#3272])
+- util: add `PollSemaphore::{add_permits, available_permits}` ([#3683])
+
+### Fixed
+
+- chore: avoid allocation if `PollSemaphore` is unused ([#3634])
+
+[#3272]: https://github.com/tokio-rs/tokio/pull/3272
+[#3634]: https://github.com/tokio-rs/tokio/pull/3634
+[#3683]: https://github.com/tokio-rs/tokio/pull/3683
+
+# 0.6.5 (March 20, 2021)
+
+### Fixed
+
+- util: annotate time module as requiring `time` feature ([#3606])
+
+[#3606]: https://github.com/tokio-rs/tokio/pull/3606
+
+# 0.6.4 (March 9, 2021)
+
+### Added
+
+- codec: `AnyDelimiter` codec ([#3406])
+- sync: add pollable `mpsc::Sender` ([#3490])
+
+### Fixed
+
+- codec: `LinesCodec` should only return `MaxLineLengthExceeded` once per line ([#3556])
+- sync: fuse PollSemaphore ([#3578])
+
+[#3406]: https://github.com/tokio-rs/tokio/pull/3406
+[#3490]: https://github.com/tokio-rs/tokio/pull/3490
+[#3556]: https://github.com/tokio-rs/tokio/pull/3556
+[#3578]: https://github.com/tokio-rs/tokio/pull/3578
+
+# 0.6.3 (January 31, 2021)
+
+### Added
+
+- sync: add `ReusableBoxFuture` utility ([#3464])
+
+### Changed
+
+- sync: use `ReusableBoxFuture` for `PollSemaphore` ([#3463])
+- deps: remove `async-stream` dependency ([#3463])
+- deps: remove `tokio-stream` dependency ([#3487])
+
+# 0.6.2 (January 21, 2021)
+
+### Added
+
+- sync: add pollable `Semaphore` ([#3444])
+
+### Fixed
+
+- time: fix panics on updating `DelayQueue` entries ([#3270])
+
+# 0.6.1 (January 12, 2021)
+
+### Added
+
+- codec: `get_ref()`, `get_mut()`, `get_pin_mut()` and `into_inner()` for
+  `Framed`, `FramedRead`, `FramedWrite` and `StreamReader` ([#3364]).
+- codec: `write_buffer()` and `write_buffer_mut()` for `Framed` and
+  `FramedWrite` ([#3387]).
+
+# 0.6.0 (December 23, 2020)
+
+### Changed
+- depend on `tokio` 1.0.
+
+### Added
+- rt: add constructors to `TokioContext` (#3221).
+
+# 0.5.1 (December 3, 2020)
+
+### Added
+- io: `poll_read_buf` util fn (#2972).
+- io: `poll_write_buf` util fn with vectored write support (#3156).
+
+# 0.5.0 (October 30, 2020)
+
+### Changed
+- io: update `bytes` to 0.6 (#3071).
+
+# 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
+
+[#3487]: https://github.com/tokio-rs/tokio/pull/3487
+[#3464]: https://github.com/tokio-rs/tokio/pull/3464
+[#3463]: https://github.com/tokio-rs/tokio/pull/3463
+[#3444]: https://github.com/tokio-rs/tokio/pull/3444
+[#3387]: https://github.com/tokio-rs/tokio/pull/3387
+[#3364]: https://github.com/tokio-rs/tokio/pull/3364
+[#3270]: https://github.com/tokio-rs/tokio/pull/3270
+[#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