Update CHANGELOG.md

Author: nicolaskruchten

CHANGELOG.md

@@ -2,6 +2,12 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [4.8.2] - unreleased
+
+### Fixed
+
+- Fixed special cases with `px.sunburst` and `px.treemap` with `path` input ([#2524](https://github.com/plotly/plotly.py/pull/2524))
+
 ## [4.8.1] - 2020-05-28
 
 ### Fixed