Update CHANGELOG.md

CHANGELOG.md

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 # Roo Cline Changelog
 
-## 3.1.0
+## [3.1.0]
 
-### Minor Changes
-
--   3.1
-
-### Patch Changes
-
--   Fix bug with clearing custom instructions
+-   You can now customize the role definition and instructions for each chat mode (Code, Architect, and Ask), either through the new Prompts tab in the top menu or mode-specific .clinerules-mode files. Prompt Enhancements have also been revamped: the "Enhance Prompt" button now works with any provider and API configuration, giving you the ability to craft messages with fully customizable prompts for even better results.
 -   Add a button to copy markdown out of the chat
 
 ## [3.0.3]