docs: updated CHANGELOG.md

Author: bednar

CHANGELOG.md

@@ -6,6 +6,9 @@
 ### Bug Fixes
 1. [#206](https://github.com/influxdata/influxdb-client-python/pull/207): Use default (system) certificates instead of Mozilla's root certificates (certifi.where())
 
+### API
+1. [#209](https://github.com/influxdata/influxdb-client-python/pull/209): Allow setting shard-group durations for buckets via API
+
 ### Documentation
 1. [#202](https://github.com/influxdata/influxdb-client-python/pull/202): Added an example how to use RxPY and sync batching
 

tests/test_BucketsApi.py

@@ -71,9 +71,8 @@ def test_create_bucket_retention_list(self):
 
         bucket_name = generate_bucket_name()
 
-        retention = BucketRetentionRules
         ret_list = []
-        retention.every_seconds = 3600
+        retention = BucketRetentionRules(every_seconds=3600)
         retention.type = "expire"
         ret_list.append(retention)