azure-function-dependency-injection: Not working with netcoreapp2.1?

My function app is targeting netcoreapp2.1 - is it supposed to work with that?

I’m getting the error:

[29-Oct-18 14:09:22] Error indexing method 'WebhookProcessor.Run'
[29-Oct-18 14:09:22] Microsoft.Azure.WebJobs.Host: Error indexing method 'WebhookProcessor.Run'. Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'cc1' to type ICC1. Make sure the parameter Type is supported by the binding. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

My project file looks like this:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <AzureFunctionsVersion>V2</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="3.0.1" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.23" />
    <PackageReference Include="Willezone.Azure.WebJobs.Extensions.DependencyInjection" Version="1.0.1" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

Startup class:

using MyApp.Functions;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Azure.WebJobs.Logging;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System;
using Willezone.Azure.WebJobs.Extensions.DependencyInjection;

[assembly: WebJobsStartup(typeof(Startup))]
namespace MyApp.Functions
{
	internal class Startup : IWebJobsStartup
	{
		public void Configure(IWebJobsBuilder builder) =>
				builder.AddDependencyInjection<ServiceProviderBuilder>();
	}

	internal class ServiceProviderBuilder : IServiceProviderBuilder
	{
		private readonly ILoggerFactory _loggerFactory;

		public ServiceProviderBuilder(ILoggerFactory loggerFactory) =>
				_loggerFactory = loggerFactory;

		public IServiceProvider Build()
		{
			var services = new ServiceCollection();

			services.AddTransient<ICC1, CC1>();

			return services.BuildServiceProvider();
		}
	}

	public interface ICC1
	{
		int MyProperty { get; set; }
	}

	public class CC1 : ICC1
	{
		public CC1()
		{
			MyProperty = 42;
		}
		public int MyProperty { get; set; }
	}
}

My function Run method:

[FunctionName("WebhookProcessor")]
public static async Task Run(
	[QueueTrigger("webhooks")] CloudQueueMessage queueMessage,
	[Table("webhooks")] CloudTable webhooksTable,
	[Blob("webhooks", FileAccess.ReadWrite)] CloudBlobContainer webhooksContainer,
	[Inject]ICC1 cc1,
	ILogger logger)
{
}

I have copied Directory.Build.targets into the folder of my project file.

Any ideas?