remove unused usings

Author: Jacques Kang

src/JKang.IpcServiceFramework.Client/IpcServiceClient.cs

@@ -1,8 +1,6 @@
 using JKang.IpcServiceFramework.IO;
 using JKang.IpcServiceFramework.Services;
-using Newtonsoft.Json.Linq;
 using System;
-using System.IO;
 using System.IO.Pipes;
 using System.Threading.Tasks;
 

src/JKang.IpcServiceFramework.Server/IpcServiceHost.cs

@@ -2,7 +2,6 @@
 using JKang.IpcServiceFramework.Services;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
-using Newtonsoft.Json.Linq;
 using System;
 using System.IO.Pipes;
 using System.Reflection;