Add pending changelog entry for the previous commit

TheBlueMatt · TheBlueMatt · commit 008a291dd9b5 · 2024-07-10T18:56:39.000Z
diff --git a/pending_changelog/3160-format-change.txt b/pending_changelog/3160-format-change.txt
@@ -0,0 +1,4 @@
+## Backwards Compatibility
+ * `impl_writeable_tlv_based_enum[_upgradable]`'s writing of tuple variants has
+   changed format. Users of this macro who are reading/writing tuple variants
+   will need to perform a format-change to update their serialized data (#3160).
