Add missing pending changelog for downgrade on unsafe funding

TheBlueMatt · TheBlueMatt · commit 3b70bd294c77 · 2024-08-27T19:31:25.000Z
diff --git a/pending_changelog/3259-no-downgrade.txt b/pending_changelog/3259-no-downgrade.txt
@@ -0,0 +1,4 @@
+# Backwards Compatibility
+ * Downgrading after using `ChannelManager`'s
+   `unsafe_manual_funding_transaction_generated` may cause deserialization of
+   `ChannelManager` to fail with an `Err` (#3259).
