Add Unreleased entry to CHANGELOG.md

Author: tylerbarker

CHANGELOG.md

@@ -1,5 +1,30 @@
 # Changelog
 
+## Unreleased
+
+### Added
+
+- **DuckDB support** via `duckdbex` driver
+  - `SqlKit.DuckDB.connect/2` and `disconnect/1` for direct connections
+  - `SqlKit.DuckDB.Pool` - NimblePool-based connection pool with supervision
+  - File-based SQL support via `:backend` option (`backend: {:duckdb, pool: PoolName}`)
+  - Automatic hugeint to integer conversion
+  - PostgreSQL-style `$1, $2, ...` parameter placeholders
+
+- **Prepared statement caching** for DuckDB pools
+  - Automatic caching of prepared statements per connection
+  - Configurable via `:cache` option (default: true)
+
+- **Streaming support** for DuckDB large result sets
+  - `SqlKit.DuckDB.stream!/3` and `stream_with_columns!/3` for direct connections
+  - `SqlKit.DuckDB.Pool.with_stream!/5` and `with_stream_and_columns!/6` for pools
+  - `with_stream!/3` and `with_stream_and_columns!/4` for file-based SQL modules
+
+- **Pool tuning options**
+  - `:timeout` option for checkout operations (default: 5000ms)
+  - Lazy connection initialization
+  - Documented pool behavior and configuration
+
 ## 0.1.0
 
 - Initial release