title: Cant create a API Documentation for whole package using pdoc3
body: <p>I am trying to generate a API Documentation for the whole directory.</p>
  <p>When I enter:</p>
  <pre><code>pdoc3 . --html -o docs
  </code></pre>
  <p>I get a error message saying:</p>
  <pre><code>invalid command name '.'
  </code></pre>
  <p>Same happens when I specify a directory with the name tests under:</p>
  <pre><code>pdoc3 ./tests --html -o docs
  
  invalid command name './tests'
  </code></pre>