Display completed items with a strike-through option

While it is nice to sometimes remove a completed item entirely from one's view, I find that I am entering things I have already completed because I don't see them infront of me as done!

Most other todo list apps will strike through the completed item and move it to the bottom of the project or list. From there I think you can either delete it entirely or hide it, which would result in it then moving to the "Done Settings"