title: Vim-style keys to navigate up and down in Omnicomplete box
body: <p>One of the reasons that I moved from emacs to vim was to avoid awkward keybindings such as Ctrl+N and Ctrl+P for up and down. I would prefer more ergonomic keys like hjkl. However, I didn't find a way to navigate in Omnicomplete box without using arrow keys or Ctrl+N/P.</p>
  
  <p>Does vim provide other keys for up and down?</p>
  
  <p><img src="https://i.stack.imgur.com/nwyyr.png" alt="enter image description here"></p>