Update CHANGELOG.md

Author: m-ad

CHANGELOG.md

@@ -12,7 +12,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
       this feature was anonymously sponsored: thank you to our sponsor!
     - Add `marker.cornerradius` attribute to `treemap` trace [[#6351](https://github.com/plotly/plotly.js/pull/6351)]
 ### Fixed
-  - Fixed the usage of sume deprecated NumPy types which were removed in NumPy 1.24 [[#3997](https://github.com/plotly/plotly.py/pull/3997)]
+  - Fixed the usage of some deprecated NumPy types which were removed in NumPy 1.24 [[#3997](https://github.com/plotly/plotly.py/pull/3997)]
+  - Fixed bug for trendlines with datetime axes [[#3683](https://github.com/plotly/plotly.py/issues/3683)]
 
 ## [5.11.0] - 2022-10-27