Update BaseNfoSaver.cs

MediaBrowser.XbmcMetadata/Savers/BaseNfoSaver.cs

@@ -206,6 +206,7 @@ namespace MediaBrowser.XbmcMetadata.Savers
             // On Windows, saving the file will fail if the file is hidden or readonly
             FileSystem.SetAttributes(path, false, false);
 
+            // use FileShare.None as this bypasses dotnet bug dotnet/runtime#42790 .
             using (var filestream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None))
             {
                 stream.CopyTo(filestream);