title: What does "Skipping virtualenv creation, as specified in config file." mean?
body: <p>When I run poetry commands, I get the message:</p>
  <pre><code>Skipping virtualenv creation, as specified in config file.
  </code></pre>
  <p>I don't remember setting such a thing, and I don't really see anything relevant in the pyproject.toml. What config file is poetry talking about?</p>