title: maya.parse fails on certain dates (AttributeError: 'NoneType' object has no attribute 'replace')
body: <p>maya.parse function throws an error when attempting to parse certain ISO string dates.</p>
  <p>Example:</p>
  <p><code>maya.parse(&quot;Mon, 02 Mar 2020 00:00:00 GMT&quot;)</code></p>
  <p>Working Examples:</p>
  <p><code>maya.parse(&quot;Wed, 02 Sep 2020 00:00:00 GMT&quot;)</code>
  <code>&lt;MayaDT epoch=1599004800.0&gt;</code></p>
  <p><code>maya.parse(&quot;Tue, 01 Sep 2020 00:00:00 GMT&quot;)</code>
  <code>&lt;MayaDT epoch=1598918400.0&gt;</code></p>
  <pre><code>  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/maya/core.py&quot;, line 766, in parse
      dt = pendulum.parse(str(string), **options)
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/pendulum/parser.py&quot;, line 29, in parse
      return _parse(text, **options)
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/pendulum/parser.py&quot;, line 56, in _parse
      tz=parsed.tzinfo or options.get(&quot;tz&quot;, UTC),
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/pendulum/__init__.py&quot;, line 111, in datetime
      tz = _safe_timezone(tz)
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/pendulum/__init__.py&quot;, line 82, in _safe_timezone
      elif obj.tzname(None) == &quot;UTC&quot;:
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/dateutil/tz/tz.py&quot;, line 238, in tzname
      return self._tznames[self._isdst(dt)]
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/dateutil/tz/tz.py&quot;, line 291, in _isdst
      dstval = self._naive_is_dst(dt)
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/dateutil/tz/tz.py&quot;, line 259, in _naive_is_dst
      timestamp = _datetime_to_timestamp(dt)
    File &quot;/Users/eanna/.local/share/virtualenvs/yo-_4WEwAWG/lib/python3.7/site-packages/dateutil/tz/tz.py&quot;, line 1814, in _datetime_to_timestamp
      return (dt.replace(tzinfo=None) - EPOCH).total_seconds()
  AttributeError: 'NoneType' object has no attribute 'replace'
  </code></pre>
  <p><strong>Environment and Version</strong></p>
  <ul>
  <li>OS (incl. terminal and shell used): Mac OS Catalina 10.15.6</li>
  <li>Python Version: 3.7</li>
  <li>maya Version: 0.6.1</li>
  <li>Your timezone: British Summer Time</li>
  </ul>