Update CHANGELOG.md

Author: cristianoc

CHANGELOG.md

@@ -71,6 +71,7 @@
 - Cleanup: remove tracking of uncurried state in parser/printer. https://github.com/rescript-lang/rescript-compiler/pull/6888
 - Remove `%opaque` primitive. https://github.com/rescript-lang/rescript-compiler/pull/6892
 - Reunify JsxC/JsxU -> Jsx etc. https://github.com/rescript-lang/rescript-compiler/pull/6895
+- Remove the transformation of `foo(1,2)` into `Js.Internal.opaqueFullApply(Internal.opaque(f), 1, 2)`, and change the back-end to treat all applications as uncurried. https://github.com/rescript-lang/rescript-compiler/pull/6893
 
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