update CHANGELOG.md

Author: StijnCaerts

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 - Exclude unset fields in search response [#166](https://github.com/stac-utils/stac-fastapi-elasticsearch/issues/166)
 - Upgrade stac-fastapi to v2.4.9 [#172](https://github.com/stac-utils/stac-fastapi-elasticsearch/pull/172)
+- Set correct default filter-lang for GET /search requests [#179](https://github.com/stac-utils/stac-fastapi-elasticsearch/issues/179)
 
 ## [v1.0.0]