Pending blog post for future in Middleman

By using the middleman-blog gem, the middleman build command won’t build posts that’s in the future timestamp.

By using the periodically deploy script. I can now set a pending post in my middleman source by setting a future date. I can preview the future post locally with middleman server. When everything is set, I just wait for the automatically deployment to deploy written-and-pending post when the date arrives.