Make internal types visible to WinRT test project

Fixes issue with UnitsNetException not visible in tests.

Author: angularsen

UnitsNet/Properties/AssemblyInfo.WindowsRuntimeComponent.cs

@@ -40,4 +40,5 @@
 [assembly: NeutralResourcesLanguage("")]
 [assembly: CLSCompliant(true)]
 [assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: InternalsVisibleTo("UnitsNet.WindowsRuntimeComponent.Tests")]