Update release notes wrt #291

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -207,3 +207,8 @@ Emanuel Trandafir (@etrandafir93)
 Joo Hyuk Kim (@JooHyukKim)
  * Fixed #308: Can't deserialize `OffsetDateTime.MIN`: Invalid value for EpochDay
   (2.18.2)
+
+Kevin Mahon (@Strongbeard)
+ * Fixed #291: `InstantDeserializer` fails to parse negative numeric timestamp strings
+   for pre-1970 values
+  (2.18.4)

release-notes/VERSION-2.x

@@ -8,6 +8,13 @@ Modules:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.18.4 (not yet released)
+
+#291: `InstantDeserializer` fails to parse negative numeric timestamp strings
+  for pre-1970 values
+ (reported by @advorako)
+ (fixed by Kevin M)
+
 2.18.3 (28-Feb-2025)
 
 #333: `ZonedDateTime` serialization with `@JsonFormat.pattern` never uses it