Running example reports project throws exception

[wayne-o]

Description

**fail: Microsoft.AspNetCore.Server.Kestrel[13]
Connection id "0HM019D11V3H2", Request id "0HM019D11V3H2:00000001": An unhandled exception was thrown by the application.
System.InvalidOperationException: Synchronous operations are disallowed. Call WriteAsync or set AllowSynchronousIO to true instead.
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.Flush()
at JsonApiDotNetCore.Middleware.JsonApiMiddleware.FlushResponseAsync(HttpResponse httpResponse, JsonSerializerSettings serializerSettings, Error error) in E:\src\JsonApiDotNetCore\src\JsonApiDotNetCore\Middleware\JsonApiMiddleware.cs:line 149
at JsonApiDotNetCore.Middleware.JsonApiMiddleware.ValidateAcceptHeaderAsync(HttpContext httpContext, JsonSerializerSettings serializerSettings) in E:\src\JsonApiDotNetCore\src\JsonApiDotNetCore\Middleware\JsonApiMiddleware.cs:line 118
at JsonApiDotNetCore.Middleware.JsonApiMiddleware.Invoke(HttpContext httpContext, IControllerResourceMapping controllerResourceMapping, IJsonApiOptions options, ICurrentRequest currentRequest, IResourceGraph resourceGraph) in E:\src\JsonApiDotNetCore\src\JsonApiDotNetCore\Middleware\JsonApiMiddleware.cs:line 45
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)

E:\src\JsonApiDotNetCore\src\Examples\ReportsExample\bin\Debug\netcoreapp3.1\ReportsExample.exe (process 27552) exited with code -1.**
...

Environment

Windows - netcoreapp3.1

• JsonApiDotNetCore Version: MASTER
• Other Relevant Package Versions: