Update release notes wrt #1057

Author: k163377

release-notes/CREDITS-2.x

@@ -15,7 +15,12 @@ Authors:
 
 Contributors:
 
-# 2.20.0 (not yet released)
+# 2.20.1 (not yet released)
+
+WrongWrong (@k163377)
+* #1057: Fixed a regression related to deserializing value classes with private constructor
+
+# 2.20.0 (28-Aug-2025)
 
 WrongWrong (@k163377)
 * #1025: Deprecate MissingKotlinParameterException and replace with new exception

release-notes/VERSION-2.x

@@ -16,6 +16,10 @@ Co-maintainers:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.20.1 (not yet released)
+
+#1057: The issue where deserialization of value classes using private constructor failed starting from version 2.20.0 has been fixed.
+
 2.20.0 (28-Aug-2025)
 
 #1025: When a null is entered for a non-null parameter, the KotlinInvalidNullException is now thrown instead of the