docs: update CHANGELOG

CHANGELOG.md

@@ -10,10 +10,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - [Variant data type](https://clickhouse.com/docs/en/sql-reference/data-types/variant) support ([#170]).
 
+### Changed
+- MSRV is now 1.73 due to changes in `bstr` and `hyper-rustls` dependencies ([#180]).
+
 ### Fixed
 - query/cursor: return `NotEnoughData` if a row is unparsed when the stream ends ([#185]).
 
 [#170]: https://github.com/ClickHouse/clickhouse-rs/pull/170
+[#180]: https://github.com/ClickHouse/clickhouse-rs/pull/180
 [#185]: https://github.com/ClickHouse/clickhouse-rs/pull/185
 
 ## [0.13.1] - 2024-10-21