Fix typo in CHANGELOG

About newly-introduced action in #621 for which I forgot to update the CHANGELOG after renaming the action

Author: AliSoftware

CHANGELOG.md

@@ -10,7 +10,7 @@ _None_
 
 ### New Features
 
-- Introduce new `openai_generate` action to get responses to a prompt/question from OpenAI API. [#621]
+- Introduce new `openai_ask` action to get responses to a prompt/question from OpenAI API. [#621]
 
 ### Bug Fixes