Optimize using

Wox.Infrastructure/Exception/WoxPluginException.cs

@@ -1,6 +1,4 @@
-using Wox.Plugin;
-
-namespace Wox.Infrastructure.Exception
+namespace Wox.Infrastructure.Exception
 {
     public class WoxPluginException : WoxException
     {

Wox.Infrastructure/Logger/Log.cs

@@ -1,6 +1,4 @@
-using System.Diagnostics;
-using NLog;
-using Wox.Infrastructure.Exception;
+using NLog;
 
 namespace Wox.Infrastructure.Logger
 {

Wox.Infrastructure/Stopwatch.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Diagnostics;
 using Wox.Infrastructure.Logger;
 
 namespace Wox.Infrastructure

Wox.Infrastructure/Storage/JsonStorage.cs

@@ -1,5 +1,4 @@
-using System;
-using System.IO;
+using System.IO;
 using System.Threading;
 using Newtonsoft.Json;