Update CHANGELOG for version 0.6.5

Updated changelog for version 0.6.5, detailing fixes for cancellation Future marking in awaitCompletion and awaitAfterCancellation methods, and changes to error handling and Waker optimization.

Author: EdmondDantes

CHANGELOG.md

@@ -11,7 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **`Scope::awaitCompletion()` not marking cancellation Future as used**: The cancellation token passed to `awaitCompletion()` was never marked with `RESULT_USED` / `EXC_CAUGHT`, causing a spurious "Future was never used" warning when the Future was destroyed. Additionally, early return paths (scope already finished, closed, or cancelled) skipped the marking entirely. Fixed by setting flags immediately after parameter parsing, before any early returns.
 - **`Scope::awaitAfterCancellation()` not marking cancellation Future as used**: Same issue as `awaitCompletion()` — the optional cancellation Future was only marked when the method reached `resume_when`, but early returns bypassed it. Fixed identically.
 
-## [0.6.5] -
+## [0.6.5] - 2026-03-29
 
 ### Changed
 - **ZEND_ASYNC_SUSPEND** No longer throws an error when called with an empty array of events.
@@ -351,4 +351,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Basic suspend/resume operations
 - Initial test framework
 - Context switching mechanisms
-- Basic scheduler implementation
+- Basic scheduler implementation