Update CHANGELOG.md

Author: jonhealy1

CHANGELOG.md

@@ -10,7 +10,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - Added configurable landing page ID `STAC_FASTAPI_LANDING_PAGE_ID` [#352](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/352)
-- Updated dynamic mapping for items to map long values to double versus float [#326](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/326)
 
 ### Changed