[readme] UWP support status in readme not updated

[dodikk]

According to release notes, the package is supposed to work under UWP platform.

2.0.0

[Update] Adding support for netstandard2.0

[Update] Adding support for UWP

The "Platform Support" section seems to lack this mention.

Platform | Supported | Version | Renderer
-- | -- | -- | --
Xamarin.iOS Unified | Yes | iOS 8.1+ | UISegmentedControl
Xamarin.Android | Yes | API 18+ | RadioGroup

[dodikk]

UWP does not seem to work for me. The reference and nuget package is added but then the "undefined reference" build errors take place.