Added changelog entry.

plotly · Apr 13, 2022 · d9a7a66 · d9a7a66
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 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+### Fixed
+- [#1968](https://github.com/plotly/dash/pull/1968) Fix bug [#1877](https://github.com/plotly/dash/issues/1877), code which uses `merge_duplicate_headers` and `style_header_conditional` to highlight columns, it incorrectly highlights header cells.
+
 ## [2.3.1] - 2022-03-29
 
 ### Fixed