add changelog

Signed-off-by: Brian L. Troutwine <brian.troutwine@datadoghq.com>

Author: blt

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Added
 - Added configuration surface area to the OTel logs payload generator, in a
   manner similar to OTel metrics.
+## Changed
+- Lading toolchain is now 1.89.0
 
 ## [0.27.0]
 ## Added