Remove already implemented feature from roadmap

Author: stippi

README.md

@@ -325,5 +325,3 @@ Below are some topics that are likely the next focus.
   This increases the success rate of matching search blocks quite a bit, but certain ways of fuzzy matching might increase the success even more.
   Failed matches introduce quite a bit of inefficiency, since they almost always trigger the LLM to re-read a file.
   Even when the error output of the `replace_in_file` tool includes the complete file and tells the LLM *not* to re-read the file.
-- **Edit user messages**: Editing a user message should create a new branch in the session.
-  The user should still be able to toggle the active banches.