Update lxml to 3.7.2

[pyup-bot]

There's a new version of lxml available.
You are currently using 3.6.0. I have updated it to 3.7.2

These links might come in handy: PyPI | Changelog | Homepage

Changelog

3.7.1

==================

• No source changes, issued only to solve problems with the
  binary packages released for 3.7.0.

3.7.0

==================

Features added

• GH217: XMLSyntaxError now behaves more like its SyntaxError
  baseclass. Patch by Philipp A.

• GH216: HTMLParser() now supports the same collect_ids parameter
  as XMLParser(). Patch by Burak Arslan.

• GH210: Allow specifying a serialisation method in xmlfile.write().
  Patch by Burak Arslan.

• GH203: New option default_doctype in HTMLParser that allows
  disabling the automatic doctype creation. Patch by Shadab Zafar.

• GH201: Calling the method .set('attrname') without value argument
  (or None) on HTML elements creates an attribute without value that
  serialises like <div attrname></div>. Patch by Daniel Holth.

• GH197: Ignore form input fields in form_values() when they are
  marked as disabled in HTML. Patch by Kristian Klemon.

Bugs fixed

• GH206: File name and line number were missing from XSLT error messages.
  Patch by Marcus Brinkmann.

Other changes

• Log entries no longer allow anything but plain string objects as message text
  and file name.

• zlib is included in the list of statically built libraries.

3.6.4

==================

• GH204, LP1614693: build fix for MacOS-X.

3.6.3

==================

• LP1614603: change linker flags to build multi-linux wheels

3.6.2

==================

• LP1614603: release without source changes to provide cleanly built Linux wheels

3.6.1

==================

Features added

• GH180: Separate option inline_style for Cleaner that only removes style
  attributes instead of all styles. Patch by Christian Pedersen.

• GH196: Windows build support for Python 3.5. Contribution by Maximilian Hils.

Bugs fixed

• GH199: Exclude file fields from FormElement.form_values (as browsers do).
  Patch by Tomas Divis.

• GH198, LP1568167: Try to provide base URL from Resolver.resolve_string().
  Patch by Michael van Tellingen.

• GH191: More accurate float serialisation in objectify.FloatElement.
  Patch by Holger Joukl.

• LP1551797: Repair XSLT error logging. Patch by Marcus Brinkmann.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #150 into master will not change coverage

@@           master   #150   diff @@
====================================
  Files           1      1          
  Lines           2      2          
  Methods         0      0          
  Messages        0      0          
  Branches        0      0          
====================================
  Hits            2      2          
  Misses          0      0          
  Partials        0      0          

Powered by Codecov. Last update 77eb696...77ddd7f