Update changelog with CMAB decide options

Add documentation for new public CMAB cache control options:
- IgnoreCMABCache
- ResetCMABCache
- InvalidateUserCMABCache

Author: Mat001

CHANGELOG.MD

@@ -21,6 +21,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   - `NewDefaultConfig()` function for default CMAB configuration
 - **Client Factory**: `WithCmabConfig(*cmab.Config) OptionFunc` - New option for setting CMAB configuration
 - **Event Metadata**: `CmabUUID` field added to DecisionMetadata for CMAB tracking
+- **New Decide Options** for CMAB cache control:
+  - `IgnoreCMABCache` - Ignore CMAB cache and make fresh requests
+  - `ResetCMABCache` - Reset the entire CMAB cache
+  - `InvalidateUserCMABCache` - Invalidate CMAB cache entries for specific user
 
 #### Multi-Region and Notification Changes
 - **Project Config Interface**: `GetRegion() string` method for multi-region support