[meta] prepare release

Author: sunshowers

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## [0.4.0] - 2025-02-12
+
+### Added
+
+- Added the ability to get global and group *slot numbers* for each future. Slot numbers are *unique* for as long as the future lives and are freed once the future is complete. Slot numbers are also *compact* because they start from 0, and the smallest possible number is assigned to them.
+
+### Changed
+
+- As a result of the ability to get slot numbers, the stream must now return a closure of `FnOnce(FutureQueueContext) -> impl Future`.
+
 ## [0.3.0] - 2023-03-18
 
 ### Changed
@@ -42,6 +52,7 @@
 
 - Initial release.
 
+[0.4.0]: https://github.com/nextest-rs/future-queue/releases/tag/0.4.0
 [0.3.0]: https://github.com/nextest-rs/future-queue/releases/tag/0.3.0
 [0.2.2]: https://github.com/nextest-rs/future-queue/releases/tag/0.2.2
 [0.2.1]: https://github.com/nextest-rs/future-queue/releases/tag/0.2.1