Docs: Update CHANGELOG for v0.2.0

Author: Chocapikk

CHANGELOG.md

@@ -8,6 +8,15 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- AsyncClient with full async/await support using httpx
+- Simple `search()` API accepting raw query strings
+- `get_domain()` method for domain lookups
+- Streaming `bulk_export_stream()` for memory-efficient exports
+- `serialize_queries()` helper to reduce query serialization duplication
+- Async example in `example/example_async_client.py`
+
 ### Changed
 
 - Updated l9format requirement from =1.3.2 to =1.4.0 ([ae676d9])