revert changelog

Author: jonhealy1

CHANGELOG.md

@@ -9,8 +9,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 
+- Added core library package for common logic [#186]https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/186
+
 ### Changed
 
+- Moved Elasticsearch and Opensearch backends into separate packages [#186]https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/pull/186
+
 ### Fixed
 
 ## [v1.1.0]