Update CHANGELOG.md (Azure#30485)

Author: needuv

sdk/ml/azure-ai-ml/CHANGELOG.md

@@ -15,6 +15,18 @@
 ### Other Changes
 
 
+## 1.7.2 (2023-05-18)
+
+### Features Added
+- Public preview support for new schedule type `MonitorSchedule`
+
+
+## 1.7.1 (2023-05-17)
+
+### Bugs Fixed
+- Fixed an issue where `OnlineDeployment.provisioning_state` was incorrectly deserialized and set as `None`
+
+
 ## 1.7.0 (2023-05-15)
 
 ### Features Added