Add reference to #161 in changelog

Author: Jean85

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
  - Add config for autowiring the client (#158, thanks @gander)
 ### Changed
  - Migrate YAML config to XML; drop dependency on `symfony/yaml` (#155, thanks @Pierstoval)
+### Fixed
+ - Remove deprecation raised by Symfony 4.2 (#161, thanks @chalasr)
 
 ## 2.0.3 - 2018-06-01
 ### Added