title: Is there any draft system for Single Types in strapi?
body: <p>I wanted to save draft in strapi for single types without publishing it. Right now if  i save the changes it will be published directly. 
  I tried using a boolean - published, and show the data on frontend app when published is true. This way if the published bool is false whole single page data will not be shown. 
  I want it so that previous data is still there but not the new unpublished data.</p>
  
  <p>Is there any way to make this achievable?  </p>