add changelog

Author: cometkim

CHANGELOG.md

@@ -17,7 +17,9 @@
 - Fix making the static import for the dynamic import of external ffi https://github.com/rescript-lang/rescript-compiler/pull/6664
 
 #### :nail-care: Polish
+
 - Omit `undefined` in external function calls for trailing optional arguments when not supplied. https://github.com/rescript-lang/rescript-compiler/pull/6653
+- Make pattern match suggestions to be easier to copy-paste. https://github.com/rescript-lang/rescript-compiler/pull/6656
 
 # 11.1.0-rc.3