title: tmuxinator does not update session after editing that session's project
body: <p>I have a tmuxinator project <code>some-project</code>.</p>
  
  <p>After using it, I updated it with <code>tmuxinator edit some-project</code>.
  Now when I run <code>tmuxinator start some-project</code>, I get the same session layout as before editing <code>some-project</code>.</p>
  
  <p>How can I make tmuxinator use the new project version?</p>