title: how to move up and down in vim(coc) autocomplete
body: <p>I have recently shifted from youCompleteMe to ConquerOfCompletions and I have an issue in the auto-complete. when I was using <strong>YCM</strong>, to go through the auto-complete options tab used to work. But now in <strong>COC</strong>, I am using <strong>tsserver</strong> from the javascript completions I am not able to use tab. I know arrow keys are working but they are slowing my productivity. Please provide a solution for me to solve this issue where I can easily access the auto-complete options.</p>
  <p>Thank You</p>