chore: update changelog

Author: diogomqbm

CHANGELOG.md

@@ -20,6 +20,7 @@
 - Generic JSX transform: Rename expected module name for lowercase JSX to `Elements` from `DOM`. https://github.com/rescript-lang/rescript-compiler/pull/6606
 - Generic JSX transform: Set default config params for `jsxConfig`. https://github.com/rescript-lang/rescript-compiler/pull/6606
 - Generic JSX transform: Handle namespaced names. https://github.com/rescript-lang/rescript-compiler/pull/6606
+- Fix issue with Exceptions and Extensible types runtime generation. https://github.com/rescript-lang/rescript-compiler/pull/6570
 
 #### :house: Internal