format code

src/DotXxlJob.Core/Extensions/ServiceCollectionExtensions.cs

@@ -50,7 +50,6 @@ namespace DotXxlJob.Core
             services.AddSingleton<CallbackTaskQueue>();
             services.AddSingleton<AdminClient>();
             services.AddSingleton<ITaskExecutor, TaskExecutors.BeanTaskExecutor>();
-            services.AddSingleton(new JobHandlerCache());
 
             return services;
         }

tests/DotXxlJob.Core.Tests/DefaultJobHandlerFactory.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using DotXxlJob.Core.Model;
 using Microsoft.Extensions.DependencyInjection;