Update xmltodict to 0.12.0

[pyup-bot]

This PR updates xmltodict from 0.11.0 to 0.12.0.

Changelog

0.12.0

-------

* Allow force_commits=True for getting all keys as lists (204)
* README.md: fix useless uses of cat (200)
* Add FreeBSD install instructions (199)
* Fix and simplify travis config (192)
* Add support for Python 3.7 (189)
* Drop support for EOL Python (191)
* Use Markdown long_description on PyPI (190)
* correct spelling mistake (165)
* correctly unparse booleans (180)
* Updates README.md with svg badge

Links

• PyPI: https://pypi.org/project/xmltodict
• Changelog: https://pyup.io/changelogs/xmltodict/
• Repo: https://github.com/martinblech/xmltodict

[pyup-bot]

Closing this in favor of #929