Updated README

watchOS/SpeedySloth/README.md

@@ -8,7 +8,7 @@ This sample demonstrates how to use HealthKit to build a workout app that runs i
 Build Requirements
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-Xcode 9.0 or later; iOS 11.0 SDK, watchOS 4.0 SDK or later
+Xamarin.iOS 11.0 or later, Xcode 9.0 or later
 
 Related Links
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