docs (CHANGELOG): IsPanicError function (closes #708)

Author: kamikazechaser

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- `IsPanicError` function is added to support catching of panic errors when processing tasks (PR: https://github.com/hibiken/asynq/pull/491)
+
 ## [0.24.1] - 2023-05-01
 
 ### Changed