Update CHANGELOG.md

CHANGELOG.md

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 # Microsoft Azure Mobile Services Change Log
+### Version 1.2.3
+**Managed SDK** 
+- Added support for Xamarin iOS Azure Notification Hub integration
 
 ### Version 1.2.2
 **iOS SDK**
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 **Managed SDK** 
 - Support for optimistic concurrency on delete
 - Update to Push surface area with minor object model changes. Added Registration base class in PCL and changed name within each extension to match the push notifcation surface. Example: WnsRegistration, WnsTemplateRegistration
-- Added support for Xamarin Android/iOS Azure Notification Hub integration
+- Added support for Xamarin Android Azure Notification Hub integration
 
 **Javascript SDK** 
 - Support for optimistic concurrency on delete