bip174: record combiner test vectors in changelog

bip-0174.mediawiki

@@ -9,7 +9,7 @@
   Type: Specification
   Assigned: 2017-07-12
   License: BSD-2-Clause
-  Version: 1.4.3
+  Version: 1.4.4
 </pre>
 
 ==Introduction==
@@ -589,6 +589,9 @@ able to be unserialized by an unserializer for the PSBT format.
 
 ==Changelog==
 
+* '''1.4.4''' (2026-09-23):
+** Clarify that combiner test vectors must pass in any input order unless there are conflicting fields
+** Add combiner test vectors for preserving PSBT_IN_SIGHASH_TYPE
 * '''1.4.3''' (2026-07-16):
 ** Clarify that combining PSBTs is commutative unless they have conflicting fields
 * '''1.4.2''' (2026-04-08):