Fixed namespace for HostRootDirLayoutRenderer (#799)

Author: snakefoot

src/NLog.Extensions.Hosting/Config/SetupExtensionsBuilderExtensions.cs

@@ -1,5 +1,4 @@
 using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Hosting;
 using NLog.Config;
 using NLog.Extensions.Logging;
 

src/NLog.Extensions.Hosting/LayoutRenderers/HostRootDirLayoutRenderer.cs

@@ -1,11 +1,11 @@
 using System;
 using System.IO;
 using System.Text;
-using NLog;
+using Microsoft.Extensions.Hosting;
 using NLog.Config;
 using NLog.LayoutRenderers;
 
-namespace Microsoft.Extensions.Hosting
+namespace NLog.Extensions.Hosting
 {
     /// <summary>
     /// Rendering Application Host <see cref="IHostEnvironment.ContentRootPath" />