title: Tmux not using my Powerline characters
body: <p>I have been trying to update tmux and add Powerline character support in it. I am currently using oh-my-zsh with 'agnoster' theme and powerline characters and prompt are getting displayed as they should but when i start tmux session, those character on prompt disappears and <code>_</code> is replaced with them.What can i do to rectify it.</p>
  
  <p><a href="https://pastebin.com/M5HMZaDF" rel="nofollow noreferrer">My tmux.conf</a></p>
  
  <ul>
  <li><p>Using ubuntu 16.04</p></li>
  <li><p>Output of <code>echo $TERM</code> is <code>screen-256color</code>.</p></li>
  <li>Not using tmux-powerline as it's no longer maintained.</li>
  <li>I have also tried reinstalling Powerline.</li>
  </ul>