Update six to 1.11.0

[pyup-bot]

There's a new version of six available.
You are currently using 1.10.0. I have updated it to 1.11.0

These links might come in handy: PyPI | Changelog | Homepage | Docs

Changelog

1.11.0

---

• Pull request 178: with_metaclass now properly proxies __prepare__ to the
  underlying metaclass.

• Pull request 191: Allow with_metaclass to work with metaclasses implemented
  in C.

• Pull request 203: Add parse_http_list and parse_keqv_list to moved
  urllib.request.

• Pull request 172 and issue 171: Add unquote_to_bytes to moved urllib.parse.

• Pull request 167: Add six.moves.getoutput.

• Pull request 80: Add six.moves.urllib_parse.splitvalue.

• Pull request 75: Add six.moves.email_mime_image.

• Pull request 72: Avoid creating reference cycles through tracebacks in
  reraise.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖