docs: updated CHANGELOG.md

Author: bednar

CHANGELOG.md

@@ -6,6 +6,9 @@
 ### Bug Fixes
 1. [#170](https://github.com/influxdata/influxdb-client-python/pull/170): Skip DataFrame rows without data - all fields are nan. 
 
+### CI
+1. [#175](https://github.com/influxdata/influxdb-client-python/pull/175): Updated default docker image to v2.0.2
+
 ## 1.12.0 [2020-10-30]
 
 1. [#163](https://github.com/influxdata/influxdb-client-python/pull/163): Added support for Python 3.9