title: Vagrantfile opening in SublimeText by default as Ruby extended file
body: <p>On top of my <code>Vagrantfile</code> I have: </p>
  
  <pre><code># -*- mode: ruby -*-
  # vi: set ft=ruby :
  </code></pre>
  
  <p>But every time when I open the file, I have to select manually in SublimeText 3 that I wanna set the syntax to Ruby, so it'll be readable. </p>
  
  <p>How can you set a filename to be opened as a ruby-file in this example. Because the file has no extension.</p>