Update README.md

Author: chrisriesgo

README.md

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 # Xamarin.Forms CarouselView
 
+_A version of this recipe that uses the **Xamarin.Forms.CarouselView** [from NuGet](https://www.nuget.org/packages/Xamarin.Forms.CarouselView/), can be found on [this branch](https://github.com/chrisriesgo/xamarin-forms-carouselview/issues/37)._
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+---
+
 Thanks to my friends at [Firefly Logic](https://github.com/FireflyLogic/couchbase-connect-14) and to [Michael Watson](https://github.com/xamarin/customersuccess/tree/master/samples/Xamarin.Forms/SliderView) for the inspiration in creating this custom control.
 
 This control mirrors the functionality of the CarouselPage - except the "pages" are simply Content Views.