Updatethe changelog

Author: OlegZv

CHANGELOG.md

@@ -35,6 +35,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#2942](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2942))
 - `opentelemetry-instrumentation-click`: new instrumentation to trace click commands
   ([#2994](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2994))
+- `opentelemetry-instrumentation-redis`: ability to instrument a specific client
+  ([#3142](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3142))
 
 ### Fixed