title: Merge develop branch into master branch without closing develop
body: <p>I'm learning how to use Source Tree with bitbucket and now I don't know how to do this:</p>
  
  <p>We have installed a release in our client, and we want to copy all the changes into master branch and tag it.</p>
  
  <p>If I checkout master branch and do a merge with develop branch I will lose develop branch.</p>
  
  <p>How can I move all the commits to master branch without loosing develop branch?</p>