title: PyLint/PyLint3 does not recognize docstrings
body: <p>I wrote several Python 3 modules of the following format:</p>
  
  <pre><code>def some_module():
  '''Do something.
  
  Parameters
  ----------
  Returns
  -------
  '''
  # Some code
  </code></pre>
  
  <p>When I run PyLint or PyLint3 over the file, I get the following error:</p>
  
  <blockquote>
    <p>************* Module some_module.some_module<br>
    C:  1, 0: Missing module docstring (missing-docstring)</p>
  </blockquote>
  
  <p>What am I doing wrong? Does PyLint require a specific docstring style?</p>