Update changelog

CHANGELOG.md

@@ -1,17 +1,18 @@
 # Changelog
 
-## Unreleased
-
-### Add
+## [0.19.0] 2024/4/9
 
 ### Changed
 
+- Defined `rust-version` for each crate (see [#227](https://github.com/la10736/rstest/issues/235))
+
 ### Fixed
 
 - `#[once]` fixtures now require the returned type to be
 [`Sync`](https://doc.rust-lang.org/std/marker/trait.Sync.html) to prevent UB
 when tests are executed in parallel. (see [#235](https://github.com/la10736/rstest/issues/235)
 for more details)
+
 - `#[future(awt)]` and `#[awt]` now properly handle mutable (`mut`) parameters by treating futures as immutable and
   treating the awaited rebinding as mutable.