update ChangeLog.md

msakai · Nov 6, 2021 · f9f4b7e · f9f4b7e
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 # Changelog for decision-diagrams
 
-## Unreleased changes
+## 0.2.0 (unreleased)
+
+* `BDD`'s data constructors `F` and `T` are replaced with `Leaf`, and
+  similarly `Node`'s data constructors `NodeF` and `NodeT` are
+  replaced with `NodeLeaf`.