Update changelog with 2.13.0 entry (opensearch-project#1133)

Signed-off-by: Thomas Farr <tsfarr@amazon.com>

CHANGELOG.md

@@ -36,18 +36,26 @@ This section is for maintaining a changelog for all breaking changes for the cli
 ### Dependencies
 
 ### Changed
-- Changed URL path encoding to own implementation adapted from Apache HTTP Client 5's ([#1109](https://github.com/opensearch-project/opensearch-java/pull/1109))
 
 ### Deprecated
 
 ### Removed
 
 ### Fixed
-- Fixed error when deserializing a normalizer without 'type' ([#1111](https://github.com/opensearch-project/opensearch-java/pull/1111))
-- Fixed deserialization of SearchRequest when `_source` is an array ([#1117](https://github.com/opensearch-project/opensearch-java/pull/1117))
 
 ### Security
 
+## [2.13.0] - 08/01/2024
+### Added
+- Added `searchAfterVals` to `SearchRequest` to allow passing arbitrary `FieldValue`s to `search_after` ([#1105](https://github.com/opensearch-project/opensearch-java/pull/1105))
+
+### Changed
+- Changed URL path encoding to own implementation adapted from Apache HTTP Client 5's ([#1109](https://github.com/opensearch-project/opensearch-java/pull/1109))
+
+### Fixed
+- Fixed error when deserializing a normalizer without 'type' ([#1111](https://github.com/opensearch-project/opensearch-java/pull/1111))
+- Fixed deserialization of SearchRequest when `_source` is an array ([#1117](https://github.com/opensearch-project/opensearch-java/pull/1117))
+
 ## [2.12.0] - 07/22/2024
 ### Added
 - Added support for the `parent` aggregation type ([#706](https://github.com/opensearch-project/opensearch-java/pull/706))