Update CHANGELOG.md

Author: cristianoc

CHANGELOG.md

@@ -20,6 +20,7 @@
 - Remove obsolete built-in project templates and the "rescript init" functionality. This will be replaced by the create-rescript-app project that is maintained separately.
 - Parse the attributes of labelled argument to the pattern attributes of argument instead of function.
 - Made pinned dependencies transitive: if *a* is a pinned dependency of *b* and *b* is a pinned dependency of *c*, then *a* is implicitly a pinned dependency of *c*. This change is only breaking if your build process assumes non-transitivity.
+- Curried after uncurried is not fused anymore: `(. x) => y => 3` is not equivalent to `(. x, y) => 3` anymore. It's instead equivalent to `(. x) => { y => 3 }`.
 
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