release notes

Author: CharlesDuboisSAP

docs/release_notes.md

@@ -8,7 +8,8 @@
 
 ### 🔧 Compatibility Notes
 
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+- The old OpenAI client (v1.0.0) is being deprecated in favor of the new OpenAI client (v1.4.0).
+  [See the documentation for more details](https://sap.github.io/ai-sdk/docs/java/foundation-models/openai/chat-completion)
 
 ### ✨ New Functionality