[skip ci] add CHANGELOG

Author: cometkim

CHANGELOG.md

@@ -12,6 +12,10 @@
 
 # 11.0.0-rc.5 (Unreleased)
 
+#### :nail_care: Polish
+
+- Add [`Deno`](https://deno.land/api?s=Deno) to reserved names, so that modules named `Deno` don't clash with the globally exposed `Deno` object. https://github.com/rescript-lang/rescript-compiler/pull/6428
+
 # 11.0.0-rc.4
 
 #### :rocket: New Feature