docs: update CHANGELOG.md

Author: bednar

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Bug Fixes
 1. [#636](https://github.com/influxdata/influxdb-client-python/pull/636): Handle missing data in data frames
 2. [#638](https://github.com/influxdata/influxdb-client-python/pull/638): Refactor DataFrame operations to avoid chained assignment and resolve FutureWarning in pandas, ensuring compatibility with pandas 3.0.
+2. [#641](https://github.com/influxdata/influxdb-client-python/pull/641): Correctly dispose ThreadPoolScheduler in WriteApi
 
 ### Documentation
 1. [#639](https://github.com/influxdata/influxdb-client-python/pull/639): Use Markdown for `README`