Updating IdentityModel to preview2 (#652)

build/dependencies.props

@@ -237,7 +237,7 @@
     <ExternalDependency Include="Microsoft.CSharp" Version="4.4.0" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.Extensions.PlatformAbstractions" Version="1.1.0" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.IdentityModel.Clients.ActiveDirectory" Version="3.14.1" Source="$(DefaultNuGetFeed)" />
-    <ExternalDependency Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.2.0-preview1-408290725" Source="$(DefaultNuGetFeed)" />
+    <ExternalDependency Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.2.0-preview2-41113220915" Source="$(DefaultNuGetFeed)" />
     <ExternalDependency Include="Microsoft.NET.Test.Sdk" Version="15.3.0" Source="$(DefaultNuGetFeed)" Private="true" />
     <ExternalDependency Include="Microsoft.NETCore.App" Version="1.0.5" TargetFramework="netcoreapp1.0" Source="$(DefaultNuGetFeed)">
       <!-- Multiple versions of this package required to support all netcoreapp versions -->