Update release notes wrt #920

Author: k163377

release-notes/CREDITS-2.x

@@ -15,7 +15,12 @@ Authors:
 
 Contributors:
 
-# 2.18.3 (not yet released)
+# 2.18.4 (not yet released)
+
+WrongWrong (@k163377)
+* #920: Minor refactors that do not affect behavior
+
+# 2.18.3 (28-Feb-2025)
 
 WrongWrong (@k163377)
 * #908: Additional fixes related to #904.

release-notes/VERSION-2.x

@@ -16,6 +16,10 @@ Co-maintainers:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.18.4 (not yet released)
+
+#920: Minor refactorings were made that did not affect behavior.
+
 2.18.3 (28-Feb-2025)
 
 #904: Fixed a problem where context was not being propagated properly when serializing an unboxed value of `value class`