Add Changelog entry

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to **Pipecat** will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- Added new input params to the `MarkdownTextFilter` utility. You can set
+  `filter_code` to filter code from text.
+
 ## [0.0.43] - 2024-10-10
 
 ### Added