fixing update for vnext.

NzbDrone.Common/Instrumentation/UpdateLogLayoutRenderer.cs

@@ -0,0 +1,27 @@
+using System;
+using System.IO;
+using System.Text;
+using NLog;
+using NLog.Config;
+using NLog.LayoutRenderers;
+
+namespace NzbDrone.Common.Instrumentation
+{
+    [ThreadAgnostic]
+    [LayoutRenderer("updateLog")]
+    public class UpdateLogLayoutRenderer : LayoutRenderer
+    {
+        private readonly string _appData;
+
+        public UpdateLogLayoutRenderer()
+        {
+            _appData = Path.Combine(new EnvironmentProvider().GetUpdateLogFolder(), DateTime.Now.ToString("yy.MM.d-HH.mm"));
+
+        }
+
+        protected override void Append(StringBuilder builder, LogEventInfo logEvent)
+        {
+            builder.Append(_appData);
+        }
+    }
+}