Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+# Unreleased
+
+### Added
+
+### Removed
+
+### Changed
+
+### Fixed
+
+# [0.11.0] - 2023-08-16
+
+### Added
+
+- `WeakSender`, a sender that doesn't keep the channel open
+- `Sender/Receiver::sender_count/receiver_count`, a way to query the number of senders and receivers attached to a channel
+- `Sender/Receiver::same_channel`, a way to determine whether senders and receivers are attached to the same channel
+
+### Changed
+
+- Relaxed some API features
+- Make all remaining spinlocks opt-in
+
+### Fixed
+
+- Fixed a rare race condition in the async implementation
+
+# [0.10.14] - 2022-07-21
+
+### Fixed
+
+- Fixed unbounded memory usage in `RecvFut::poll_inner`
+
+# [0.10.13] - 2022-06-10
+
+### Added
+
+- `SendSink::sender`, to get the sender of a `SendSink`
+
+# [0.10.12] - 2022-03-10
+
+### Changed
+
+- Updated `nanorand` to 0.7
+
+# [0.10.11] - 2022-02-14
+
+### Fixed
+
+- Out-of-order bug when using channels asynchronously
+
+# [0.10.10] - 2022-01-11
+
+### Added
+
+- `From<SendError>` and `From<RecvError>` impls for other error types
+- Marked futures as `#[must_use]`
+
+### Changes
+
+- Switched to scheduler-driven locking by default, with a `spin` feature to reenable the old behaviour
+- Minor doc improvements
+
+# [0.10.9] - 2021-08-25
+
+### Changed
+
+- Switched from `spinning_top` to `spin`
+
+# [0.10.8] - 2021-08-06
+
+### Changed
+
+- Updated `nanorand` to `0.6`
+
+# [0.10.7] - 2021-06-10
+
+### Fixed
+
+- Removed accidental nightly-only syntax
+
+# [0.10.6] - 2021-06-10
+
+### Added
+
+- `fn into_inner(self) -> T` for send errors, allowing for easy access to the unsent message
+
+# [0.10.5] - 2021-04-26
+
+### Added
+
+- `is_disconnected`, `is_empty`, `is_full`, `len`, and `capacity` on future types
+
+# [0.10.4] - 2021-04-12
+
+### Fixed
+
+- Shutdown-related race condition with async recv that caused spurious errors
+
+# [0.10.3] - 2021-04-09
+
+### Fixed
+
+- Compilation error when enabling `select` without `eventual_fairness`
+
+# [0.10.2] - 2021-02-07
+
+### Fixed
+
+- Incorrect pointer comparison in `Selector` causing missing receives
+
+# [0.10.1] - 2020-12-30
+
+### Removed
+
+- Removed `T: Unpin` requirement from async traits using `pin_project`
+
+# [0.10.0] - 2020-12-09
+
+### Changed
+
+- Renamed `SendFuture` to `SendFut` to be consistent with `RecvFut`
+- Improved async-related documentation
+
+### Fixed
+
+- Updated `nanorand` to address security advisory