Changes file for ticket 23966.

changes/ticket23966

@@ -0,0 +1,5 @@
+  o Code simplification and refactoring:
+    - Remove duplicate code in node_has_curve25519_onion_key() and
+      node_get_curve25519_onion_key(), and add a check for a zero microdesc
+      curve25519 onion key. Closes ticket 23966, patch by "aruna1234" and
+      "teor".