update universal platform

Author: roubachof

MaterialFrame/MaterialFrame.UWP/MaterialFrame.UWP.csproj

@@ -65,7 +65,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
-      <Version>6.2.11</Version>
+      <Version>6.2.13</Version>
     </PackageReference>
     <PackageReference Include="Xamarin.Forms">
       <Version>5.0.0.2196</Version>