docs: update CHANGELOG.md

Author: bednar

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Bug Fixes
 1. [#375](https://github.com/influxdata/influxdb-client-python/pull/375): Construct `InfluxDBError` without HTTP response 
 1. [#378](https://github.com/influxdata/influxdb-client-python/pull/378): Correct serialization DataFrame with nan values [DataFrame]
+1. [#384](https://github.com/influxdata/influxdb-client-python/pull/384): Timeout can be specified as a `float`
 
 ### CI
 1. [#370](https://github.com/influxdata/influxdb-client-python/pull/370): Add Python 3.10 to CI builds