Update ios.md

Author: ShaunaSong

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

@@ -48,7 +48,7 @@ In Xcode, create a new project:
 
     target 'UILibraryQuickStart' do
         use_frameworks!
-        pod 'AzureCommunicationUICalling', '1.6.1'
+        pod 'AzureCommunicationUICalling'
     end
     ```