Update changelog format for 0.2.0 release for consistency (#66)

Author: fnesveda

CHANGELOG.md

@@ -25,11 +25,14 @@ Changelog
 [0.2.0](../../releases/tag/v0.2.0) - 2021-08-09
 -----------------------------------------------
 
+### Added
+
+- added the `gracefully` parameter to the "Abort run" method
+
 ### Changed
 
 - replaced `base_url` with `api_url` in the client constructor
   to enable easier passing of the API server url from environment variables available to actors on the Apify platform
-- added the `gracefully` parameter to the "Abort run" method
 
 ### Internal changes