docs: add the uno platform, remove windows store (#2134)

src/Directory.build.props

@@ -12,9 +12,9 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl>https://reactiveui.net</PackageProjectUrl>
     <PackageIconUrl>https://github.com/reactiveui/styleguide/blob/master/logo/main.png?raw=true</PackageIconUrl>
-    <PackageDescription>A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin Forms, Xamarin.TVOS, Tizen, WPF, Windows Forms, Windows Store and Universal Windows Platform (UWP).</PackageDescription>    
+    <PackageDescription>A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. Supports Xamarin.iOS, Xamarin.Android, Xamarin.Mac, Xamarin Forms, Xamarin.TVOS, Tizen, WPF, Windows Forms, Universal Windows Platform (UWP) and the Uno Platform.</PackageDescription>    
     <Owners>xanaisbettsx;ghuntley</Owners>
-    <PackageTags>mvvm;reactiveui;rx;reactive extensions;observable;LINQ;events;frp;xamarin;android;ios;mac;forms;monodroid;monotouch;xamarin.android;xamarin.ios;xamarin.forms;xamarin.mac;xamarin.tvos;wpf;net;netstandard;net461;uwp;tizen</PackageTags>
+    <PackageTags>mvvm;reactiveui;rx;reactive extensions;observable;LINQ;events;frp;xamarin;android;ios;mac;forms;monodroid;monotouch;xamarin.android;xamarin.ios;xamarin.forms;xamarin.mac;xamarin.tvos;wpf;net;netstandard;net461;uwp;tizen;unoplatform</PackageTags>
     <PackageReleaseNotes>https://github.com/reactiveui/ReactiveUI/releases</PackageReleaseNotes>
     <RepositoryUrl>https://github.com/reactiveui/reactiveui</RepositoryUrl>
     <RepositoryType>git</RepositoryType>