Add exception details

Author: michaelstaib

code/complete/GraphQL/Startup.cs

@@ -71,6 +71,7 @@ public void ConfigureServices(IServiceCollection services)
                 .AddDataLoader<SessionByIdDataLoader>()
                 .AddDataLoader<SpeakerByIdDataLoader>()
                 .AddDataLoader<TrackByIdDataLoader>()
+                .ModifyRequestOptions(o => o.IncludeExceptionDetails = true)
 
                 // we make sure that the db exists and prefill it with conference data.
                 .EnsureDatabaseIsCreated()