Bump lxml from 3.8.0 to 4.4.2

[dependabot-preview]

Bumps lxml from 3.8.0 to 4.4.2.

Changelog

Sourced from lxml's changelog.

4.4.2 (2019-11-25)

Bugs fixed

• LP#1835708: ElementInclude incorrectly rejected repeated non-recursive
  includes as recursive.
  Patch by Rainer Hausdorf.

4.4.1 (2019-08-11)

Bugs fixed

• LP#1838252: The order of an OrderedDict was lost in 4.4.0 when passing it as
  attrib mapping during element creation.

• LP#1838521: The package metadata now lists the supported Python versions.

4.4.0 (2019-07-27)

Features added

• Element.clear() accepts a new keyword argument keep_tail=True to clear
  everything but the tail text. This is helpful in some document-style use cases
  and for clearing the current element in iterparse() and pull parsing.

• When creating attributes or namespaces from a dict in Python 3.6+, lxml now
  preserves the original insertion order of that dict, instead of always sorting
  the items by name. A similar change was made for ElementTree in CPython 3.8.
  See https://bugs.python.org/issue34160

• Integer elements in lxml.objectify implement the __index__() special method.

• GH#269: Read-only elements in XSLT were missing the nsmap property.
  Original patch by Jan Pazdziora.

• ElementInclude can now restrict the maximum inclusion depth via a max_depth
  argument to prevent content explosion. It is limited to 6 by default.

• The target object of the XMLParser can have start_ns() and end_ns()
  callback methods to listen to namespace declarations.

• The TreeBuilder has new arguments comment_factory and pi_factory to

... (truncated)

Commits

• 589c3c2 Prepare release of lxml 4.4.2.
• bf15ea4 Improve frontpage section on sponsoring.
• e2f4ae1 Add a link to Tidelift as a way of supporting the project.
• a2551ed Adapt doctest to libxml2 2.9.10.
• 632e44d Try to avoid redundant recompilation in appveyor by building the wheel first ...
• 355663d Fix indentation in appveyor build script.
• 6f1df3a Fix path escaping in appveyor build script.
• f1bb8b8 Install Python 3.8 into the correct directory on appveyor.
• ec24224 appveyor: test with Python 3.8 (GH-289)
• 9bab0e1 Add final Py3.8 to travis and appveyor builds.
• Additional commits viewable in compare view

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Superseded by #98.