Update CHANGELOG

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>

Author: lawofcycles

CHANGELOG.md

@@ -3,7 +3,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
-- Add Apache Spark 4.0 support ([#668](https://github.com/opensearch-project/opensearch-hadoop/issues/668))
+- Add Apache Spark 4.0 support ([#684](https://github.com/opensearch-project/opensearch-hadoop/pull/684))
 
 ### Changed
 - Switched to more reliable OpenSearch Lucene snapshot location ([#597](https://github.com/opensearch-project/opensearch-hadoop/pull/597))
@@ -152,4 +152,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 [1.2.0]: https://github.com/opensearch-project/opensearch-hadoop/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/opensearch-project/opensearch-hadoop/compare/v1.0.1...v1.1.0
 [1.0.1]: https://github.com/opensearch-project/opensearch-hadoop/compare/v1.0.0...v1.0.1
-[1.0.0]: https://github.com/opensearch-project/opensearch-hadoop/compare/v7.13.4...v1.0.0
+[1.0.0]: https://github.com/opensearch-project/opensearch-hadoop/compare/v7.13.4...v1.0.0