title: Why the substitution |version| is not working on Sphinx
body: <p>I'm new using Sphinx to document my work. I want do add the number version and release to my documentation in PDF.</p>
  <p>In the <code>conf.py</code> file, a version variable is defined that we can use in the <code>.rst</code> files like such:</p>
  <pre><code>|version|
  </code></pre>
  <p>But its not working for me, i don't know if I doing something wrong. Any suggestions?</p>