Update ios.md

Author: jpeng-ms

articles/communication-services/quickstarts/ui-library/includes/get-started-chat/ios.md

@@ -49,7 +49,7 @@ In Xcode, create a new project:
 
     target 'UILibraryQuickStart' do
         use_frameworks!
-        pod 'AzureCommunicationUIChat', '1.0.0-beta1'
+        pod 'AzureCommunicationUIChat', '1.0.0-beta2'
     end
     ```