update the README

* OxyPlot.Xamarin.Forms also supports Mac now
* the other (platform-specific) packages are deprecated,
  everything is included in OxyPlot.Xamarin.Forms by now

Author: janusw

README.md

@@ -9,7 +9,7 @@ This repository contains the implementation for Xamarin (supporting Android, iOS
 
 Package | Version | Downloads | Targets
 --------|---------|-----------|--------
-OxyPlot.Xamarin.Forms | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Forms.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Forms) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Forms.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Forms) | Xamarin.Forms (Android, iOS, UWP)
-OxyPlot.Xamarin.Android | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Android.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Android) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Android.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Android) | Xamarin.Android (MonoAndroid)
-OxyPlot.Xamarin.iOS | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.iOS.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.iOS) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.iOS.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.iOS) | Xamarin.iOS (iOS10)
-OxyPlot.Xamarin.Mac | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Mac.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Mac) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Mac.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Mac) | Xamarin.Mac (Mac20)
+OxyPlot.Xamarin.Forms | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Forms.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Forms) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Forms.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Forms) | Xamarin.Forms (Android, iOS, Mac, UWP)
+OxyPlot.Xamarin.Android | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Android.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Android) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Android.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Android) | Xamarin.Android (deprecated)
+OxyPlot.Xamarin.iOS | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.iOS.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.iOS) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.iOS.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.iOS) | Xamarin.iOS (deprecated)
+OxyPlot.Xamarin.Mac | [![NuGet](https://img.shields.io/nuget/vpre/OxyPlot.Xamarin.Mac.svg?style=flat)](https://www.nuget.org/packages/OxyPlot.Xamarin.Mac) | [![Downloads](https://img.shields.io/nuget/dt/OxyPlot.Xamarin.Mac.svg)](https://www.nuget.org/packages/OxyPlot.Xamarin.Mac) | Xamarin.Mac (deprecated)