Bump html5lib from 0.999 to 1.1

[dependabot]

Bumps html5lib from 0.999 to 1.1.

Changelog

Sourced from html5lib's changelog.

1.1

Breaking changes:

Drop support for Python 3.3. (#358)
Drop support for Python 3.4. (#421)

Deprecations:

Deprecate the html5lib sanitizer (html5lib.serialize(sanitize=True) and
html5lib.filters.sanitizer). We recommend users migrate to Bleach <https://github.com/mozilla/bleach>. Please let us know if Bleach doesn't suffice for your
use. (#443)

Other changes:

Try to import from collections.abc to remove DeprecationWarning and ensure
html5lib keeps working in future Python versions. (#403)
Drop optional datrie dependency. (#442)

1.0.1

Released on December 7, 2017

Breaking changes:

• Drop support for Python 2.6. (#330) (Thank you, Hugo, Will Kahn-Greene!)
• Remove utils/spider.py (#353) (Thank you, Jon Dufresne!)

Features:

• Improve documentation. (#300, #307) (Thank you, Jon Dufresne, Tom Most, Will Kahn-Greene!)
• Add iframe seamless boolean attribute. (Thank you, Ritwik Gupta!)
• Add itemscope as a boolean attribute. (#194) (Thank you, Jonathan Vanasco!)
• Support Python 3.6. (#333) (Thank you, Jon Dufresne!)
• Add CI support for Windows using AppVeyor. (Thank you, John Vandenberg!)
• Improve testing and CI and add code coverage (#323, #334), (Thank you, Jon Dufresne, John Vandenberg, Sam Sneddon, Will Kahn-Greene!)
• Semver-compliant version number.

Bug fixes:

• Add support for setuptools < 18.5 to support environment markers. (Thank you, John Vandenberg!)
• Add explicit dependency for six >= 1.9. (Thank you, Eric Amorde!)
• Fix regexes to work with Python 3.7 regex adjustments. (#318, #379) (Thank

... (truncated)

Commits

• f87487a Bump version for release
• 8df6cc9 Deprecate the sanitizer and recommend Bleach (#501)
• 7e52b16 Don't use cElementTree on Python 3
• b2b08cc Get lxml treewalker outputting attrs in source order again
• 38ec086 Move token normalisation to the tokenizer
• b2e4802 Speedup setting attributes on etree implementations
• b075e51 Only initialise the method dispatcher once
• 9d1a0fd Shortcut the entire meta encoding pre-parse when possible
• f1b28b0 Avoid allocating bytes slice in encoding pre-parse
• 0db23a3 Use dict on Py >= 3.7 for attributes now it is ordered
• Additional commits viewable in compare view

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