Bump lxml from 3.8.0 to 4.3.0

[dependabot-preview]

Bumps lxml from 3.8.0 to 4.3.0.

Changelog

Sourced from lxml's changelog.

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.

• Updated ISO-Schematron implementation to 2013 version (now MIT licensed)
  and the corresponding schema to the 2016 version (with optional "properties").

Other changes

• GH#270, GH#271: Support for Python 2.6 and 3.3 was removed.
  Patch by hugovk.

• The minimum dependency versions were raised to libxml2 2.9.2 and libxslt 1.1.27,
  which were released in 2014 and 2012 respectively.

• Built with Cython 0.29.2.

4.2.6 (2019-01-02)

Bugs fixed

• LP#1799755: Fix a DeprecationWarning in Py3.7+.

• Import warnings in Python 3.6+ were resolved.

4.2.5 (2018-09-09)

Bugs fixed

• Javascript URLs that used URL escaping were not removed by the HTML cleaner.
  Security problem found by Omar Eissa. (CVE-2018-19787)

4.2.4 (2018-08-03)

... (truncated)

Commits

• 7303cad Prepare release of lxml 4.3.0.
• b4a7df9 Also show ccache stats after the test run, in case more files were compiled.
• 1da2827 Prioritise non-static builds in travis to get faster responsiveness.
• 925a6fb Use http(s) download URLs for build libraries instead of FTP, since it's much...
• fa6e7f9 Increase default libxml2/libxslt versions to 2.9.9 and 1.1.33.
• d255d4a Removed leftover comment from changelog.
• c2324cf Py3 fix in PDF docs builder script.
• c7bdc8c Merge lxml-4.2 branch into master.
• 1dd26eb Prepare release of 4.2.6.
• b767e9c Update changelog.
• Additional commits viewable in compare view

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Superseded by #54.