title: Python tox: show stdout/prints on successful test run?
body: <p>Sometimes I want to print some statements, to make sure unittests are running fine (even if it passes), but can't find an option that enables it.</p>
  
  <p>If tests fail, then it does show custom prints as output, but if it passes, it does ignore prints or logs (I mean, it dont see them on terminal output).</p>
  
  <p>I tried using verbosity, like <code>-vvvv</code>, but it still ignores my prints. With <code>nose</code> there is an option like <code>--nologcapture</code>. Is there something similar in <code>tox</code>?</p>