public async Task <SessionPreview> PreviewAsync(Session definition, bool includeNoneActionItems = false)
        {
            var runner  = new SessionRunner(definition, Printer);
            var preview = await runner.PreviewAsync(includeNoneActionItems, Printer);

            runners.Write(l => l.Add(new SessionEntry(runner)));
            return(preview);
        }
 public SessionEntry(SessionRunner runner)
 {
     Runner       = runner;
     CreationTime = DateTime.Now;
 }