title: How to change the auto-complete select key in Sublime Text 3?
body: <p>I have used vim for a while, in vim auto-complete, I use 'tab' 'down' to select the next candidate, 'shift+tab' 'up' to select the previous candidate, 'enter' to confirm that completion.</p>
  
  <p>But in Sublime Text 3, I found 'tab' and 'enter' are both to confirm completion,  only 'up' 'down' is to select the previous/next candidate.</p>
  
  <p>How can I set the key like vim auto-complete mode ?</p>