docs: update CHANGELOG.md

bednar · bednar · commit a6d0f8059887 · 2021-08-20T12:17:47.000+02:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## 1.21.0 [unreleased]
 
+### Features
+1. [#317](https://github.com/influxdata/influxdb-client-python/pull/317): `delete_api` also accept `datetime` as a value for `start` and `stop`
+
 ## 1.20.0 [2021-08-20]
 
 ### Features
