Update listparser to 0.19

[pyup-bot]

This PR updates listparser from 0.18 to 0.19.

Changelog

0.19

=================

*"Spring cleaning"*

Added
-----

*   Add ``requests`` as an optional dependency.
*   Add ``lxml`` as an optional dependency.
 This is currently the only way to parse malformed XML files.
*   Add support for Python 3.7 through Python 3.10.

Removed
-------

*   Drop support for CPython 3.6 and lower.
*   Drop support for IronPython.
*   Drop support for Jython.
*   Remove some ancient Jython compatibility code.
*   HTML entities are no longer automatically injected into the DTD.

 If ``lxml`` is installed and undeclared HTML entities are encountered,
 they will be ignored.

 If lxml is not installed and undeclared HTML entities are encountered,
 Python's ``xml.sax`` parser will fail to parse the document.

Fixed
-----

*   Fix some coverage messages that were output during testing.
*   Fix the combined coverage HTML report's paths.

Changed
-------

*   Migrate to a ``src/``-based directory structure.
*   Migrate to Read the Docs for documentation hosting.
*   ``parse()`` no longer accepts *etag*, *modified*, or *agent* arguments.
*   HTTP response information is no longer available in the return dictionary.
*   The unit tests no longer launch an HTTP server.
*   Coverage data is now erased before the unit tests begin.
*   ``bozo`` is now ``True`` or ``False``, not ``1`` or ``0``.
*   ``bozo_exception`` is guaranteed to exist in the return dict.
*   The RFC 822 parser now returns timezone-aware ``datetime`` objects
 instead of converting to UTC and losing timezone info.
*   Move and split ``lptest.py`` into the ``tests/`` subdirectory
 and into specific ``test_*`` files.
*   Increased test coverage reporting to include test runners.
*   Decreased the number of ``tox`` environments where listparser must be built and installed.
*   Internally rely on ``dict`` key-based lookups instead of ``SuperDict`` attribute-based lookups.
*   Cache XML parsing method lookup results to avoid excessive string formatting.
*   Change the name of the ``ListError`` to ``ListparserError``.
*   Split the codebase into multiple files.
*   Use ``tox`` to automate testing across multiple interpreters and versions.
*   Migrate to ``pytest`` for unit testing.
*   Remove dependence on the ``six`` package.
*   Add type annotations.
*   Remove compatibility code.
*   Migrate to Poetry and ``pyproject.toml`` for project configuration.
*   Change the license from LGPLv3 to MIT.
*   Use scriv to manage the CHANGELOG.

Links

• PyPI: https://pypi.org/project/listparser
• Changelog: https://pyup.io/changelogs/listparser/
• Repo: https://github.com/kurtmckee/listparser/
• Docs: https://pythonhosted.org/listparser/

[pyup-bot]

Closing this in favor of #797