Bump lxml from 3.6.0 to 4.2.5

[dependabot-preview]

Bumps lxml from 3.6.0 to 4.2.5.

Changelog

Sourced from lxml's changelog.

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.

4.2.4 (2018-08-03)

Features added

• GH#259: Allow using pkg-config for build configuration.
  Patch by Patrick Griffis.

Bugs fixed

• LP#1773749, GH#268: Crash when moving an element to another document with
  Element.insert().
  Patch by Alexander Weggerle.

4.2.3 (2018-06-27)

Bugs fixed

• Reverted GH#265: lxml links against zlib as a shared library again.

4.2.2 (2018-06-22)

Bugs fixed

• GH#266: Fix sporadic crash during GC when parse-time schema validation is used
  and the parser participates in a reference cycle.
  Original patch by Julien Greard.

• GH#265: lxml no longer links against zlib as a shared library, only on static builds.
  Patch by Nehal J Wani.

... (truncated)

Commits

• 1dee355 Py3 syntax fix in helper script.
• 171eaaa Fix typo in test file.
• 26dfc89 Prepare release of lxml 4.2.5.
• 6be1d08 Fix: make the cleaner also remove javascript URLs that use escaping.
• 1f534e2 Fix missing link on website.
• a546a5d Added tag lxml-4.2.4 for changeset 1220d40cbfe3
• 5578c4d Update changelog.
• 2bc2bce Do not statically link compiled Python modules against libxml2 & friends.
• ab76824 Fix CFLAGS in travis build.
• 0974ac5 Include "*-rc" versions of libxml2/libxslt in parsed version when downloading...
• Additional commits viewable in compare view

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Superseded by #33.