Added entry to changelog

Author: rlazo

firebase-ai/CHANGELOG.md

@@ -1,5 +1,7 @@
 # Unreleased
 
+- [changed] **Breaking Change**: Removed the `candidateCount` option from `LiveGenerationConfig`
+  (#7382)
 - [changed] Bumped internal dependencies.
 - [feature] Added support for code execution.
 - [changed] Marked the public constructors for `ExecutableCodePart` and `CodeExecutionResultPart` as
@@ -31,8 +33,6 @@
 
 # 17.1.0
 
-=======
-
 - [feature] added support for Imagen Editing, including inpainting, outpainting, control, style
   transfer, and subject references (#7075)