title: pip install Django on python3.6
body: <p>If I run <code>pip install Django</code> I get</p>
  
  <blockquote>
    <p>Requirement already satisfied: Django in
    /usr/local/lib/python2.7/dist-packages</p>
  </blockquote>
  
  <p>I'd like to use python3.6 instead (which is already installed in <code>/usr/bin/python3.6</code>). What's the correct <code>pip</code> syntax to install the last version of Django on python 3.6?</p>