[FSSDK-12546] release python v5.6.0

Author: jaeopt

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Optimizely Python SDK Changelog
 
+## 5.6.0
+May 4, 2026
+
+### New Features
+
+**Feature Rollout**: Added support for Feature Rollouts, a new experiment type
+combining Targeted Delivery simplicity with A/B test measurement capabilities.
+Feature Rollouts enable progressive rollouts with full impact analytics, metric tracking,
+and confidence intervals.
+See [Feature Rollout docs](https://support.optimizely.com/hc/en-us/articles/45552846481037-Run-Feature-Rollouts-in-Feature-Experimentation) for more information.
+
+---
+
 ## 5.5.0
 April 30th, 2026