Bump lxml from 3.6.0 to 4.3.3

[dependabot-preview]

Bumps lxml from 3.6.0 to 4.3.3.

Changelog

Sourced from lxml's changelog.

4.3.3 (2019-03-26)

Bugs fixed

• Fix leak of output buffer and unclosed files in _XSLTResultTree.write_output().

4.3.2 (2019-02-29)

Bugs fixed

• Crash in 4.3.1 when appending a child subtree with certain text nodes.

Other changes

• Built with Cython 0.29.6.

4.3.1 (2019-02-08)

Bugs fixed

• LP#1814522: Crash when appending a child subtree that contains unsubstituted
  entity references.

Other changes

• Built with Cython 0.29.5.

4.3.0 (2019-01-04)

Features added

• The module lxml.sax is compiled using Cython in order to speed it up.

• GH#267: lxml.sax.ElementTreeProducer now preserves the namespace prefixes.
  If two prefixes point to the same URI, the first prefix in alphabetical order
  is used. Patch by Lennart Regebro.

... (truncated)

Commits

• e2d9746 Prepare release of lxml 4.3.3.
• 4baad26 Fix leak of output buffer in _XSLTResultTree.write_output().
• f2981e6 Prepare release of 4.3.2.
• f529aeb Fix crash due to incorrect dict handling for text nodes.
• f8bb218 Make sure doc links are updated also for non-element nodes.
• 8c5b45b Improve cleanup handling when an exception is raised during document adaptation.
• 3f47dac Add some tests for tree modification while iterating.
• c5b06c4 Avoid instantiating node iterators when it's easy to see that they will be em...
• 79a4f70 Slightly raise the minimum CPU architecture for Linux wheels to "core2".
• fd971a5 Replace old Pyrex property syntax with @​property decorators for read-only pro...
• Additional commits viewable in compare view

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Superseded by #47.