Update CHANGELOG.md

Author: nicolaskruchten

CHANGELOG.md

@@ -12,7 +12,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Performance
 
-  - `px` methods no longer call `groupby` on the input dataframe when the result would be a single group, and no longer groups by a lambda, for significant speedups [#3765](https://github.com/plotly/plotly.py/pull/3765)
+  - `px` methods no longer call `groupby` on the input dataframe when the result would be a single group, and no longer groups by a lambda, for significant speedups [#3765](https://github.com/plotly/plotly.py/pull/3765) with thanks to [@jvdd](https://github.com/jvdd)
 
 ### Updated