updated readme to 2.1.1

Author: nmetulev

readme.md

@@ -7,7 +7,7 @@ The UWP Community Toolkit is a collection of helper functions, custom controls,
 
 | Target | Branch | Status | Recommended Nuget packages version |
 | ------ | ------ | ------ | ------ |
-| Production | rel/2.1.0 | [![Build status](https://ci.appveyor.com/api/projects/status/o60lv2tt1nbtklw8/branch/rel/2.1.0?svg=true)](https://ci.appveyor.com/project/dotnetfoundation/uwpcommunitytoolkit/branch/rel/2.1.0) | [![NuGet](https://img.shields.io/nuget/v/Microsoft.Toolkit.Uwp.svg)](https://www.nuget.org/packages/Microsoft.Toolkit.Uwp/) |
+| Production | rel/2.1.1 | [![Build status](https://ci.appveyor.com/api/projects/status/o60lv2tt1nbtklw8/branch/rel/2.1.1?svg=true)](https://ci.appveyor.com/project/dotnetfoundation/uwpcommunitytoolkit/branch/rel/2.1.1) | [![NuGet](https://img.shields.io/nuget/v/Microsoft.Toolkit.Uwp.svg)](https://www.nuget.org/packages/Microsoft.Toolkit.Uwp/) |
 | Pre-release beta testing | master | [![Build status](https://ci.appveyor.com/api/projects/status/o60lv2tt1nbtklw8/branch/master?svg=true)](https://ci.appveyor.com/project/dotnetfoundation/uwpcommunitytoolkit/branch/master) | [![MyGet](https://img.shields.io/dotnet.myget/uwpcommunitytoolkit/vpre/Microsoft.Toolkit.Uwp.svg)](https://dotnet.myget.org/gallery/uwpcommunitytoolkit) |
 
 ## Getting started