Update CHANGELOG.

Author: drazvan

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - [#58](https://github.com/NVIDIA/NeMo-Guardrails/issues/58): Fix install on Mac OS 13.
+- [#55](https://github.com/NVIDIA/NeMo-Guardrails/issues/55): Fix bug in example causing config.py to crash on computers with no CUDA-enabled GPUs.
 
 
 ## [0.3.0] - 2023-06-30