Update release notes wrt #415

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -234,3 +234,8 @@ Axel Niklasson (axelniklasson@github)
 * Contributed #388: (yaml) Add `YAMLParser.Feature.PARSE_BOOLEAN_LIKE_WORDS_AS_STRINGS`
   to allow parsing "boolean" words as strings instead of booleans
  (2.15.0)
+
+Niels Basjes (nielsbasjes@github)
+
+* Contributed #415: (yaml) Use `LoaderOptions.allowDuplicateKeys` to enforce duplicate key detection
+ (2.15.0)

release-notes/VERSION-2.x

@@ -16,6 +16,8 @@ Active Maintainers:
 
 #411: (toml) Fuzzer-found issue #57237 (buffer boundary condition)
  (contributed by @yawkat)
+#415: (yaml) Use `LoaderOptions.allowDuplicateKeys` to enforce duplicate key detection
+ (contributed by Niels B)
 
 2.15.0-rc2 (28-Mar-2023)