Update lxml requirement from <4.4 to <4.7

[dependabot-preview[bot]]

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Updates the requirements on lxml to permit the latest version.

Changelog

Sourced from lxml's changelog.

4.6.1 (2020-10-18)

Bugs fixed

• A vulnerability was discovered in the HTML Cleaner by Yaniv Nizry, which allowed JavaScript to pass through. The cleaner now removes more sneaky "style" content.

4.6.0 (2020-10-17)

Features added

• GH#310: lxml.html.InputGetter supports __len__() to count the number of input fields. Patch by Aidan Woolley.

• lxml.html.InputGetter has a new .items() method to ease processing all input fields.

• lxml.html.InputGetter.keys() now returns the field names in document order.

• GH-309: The API documentation is now generated using sphinx-apidoc. Patch by Chris Mayo.

Bugs fixed

• LP#1869455: C14N 2.0 serialisation failed for unprefixed attributes when a default namespace was defined.

• TreeBuilder.close() raised AssertionError in some error cases where it should have raised XMLSyntaxError. It now raises a combined exception to keep up backwards compatibility, while switching to XMLSyntaxError as an interface.

4.5.2 (2020-07-09)

Bugs fixed

• Cleaner() now validates that only known configuration options can be set.

• LP#1882606: Cleaner.clean_html() discarded comments and PIs regardless of the corresponding configuration option, if remove_unknown_tags was set.

• LP#1880251: Instead of globally overwriting the document loader in libxml2, lxml now

Commits

• 61432a8 Prepare release of lxml 4.6.1.
• 89e7aad Prevent combinations of <noscript> and <style> to sneak JavaScript through th...
• 264f903 Fix PDF building.
• 0486a77 Fix link to previous version in documentation.
• 2d88783 Add wheel build for Py3.9 on ARM64 for Windows.
• ff946ad Make wheel build fail more quickly if anything goes wrong along the way.
• f102799 Prepare release of lxml 4.6.0.
• 210d77e Exclude a test in Py 3.9.0 due to ET bug https://bugs.python.org/issue41900
• af2eb49 Reorder the appveyor build matrix to get the most important results quicker.
• e70e68a Include Py3.9 in travis build.
• Additional commits viewable in compare view

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[codecov-io]

Codecov Report

Merging #133 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #133   +/-   ##
=======================================
  Coverage   11.11%   11.11%           
=======================================
  Files          16       16           
  Lines        1989     1989           
=======================================
  Hits          221      221           
  Misses       1768     1768           

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[stdevel]

Implemented different fix in commit 44bc0b6f6c825abe0c3f8d8a060e5f886b879d3c

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