unreleased

* Added the seamless attribute for iframes.

* Added `itemscope` as boolean attribute

https://github.com/html5lib/html5lib-python/issues/194

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, Geoffrey 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

you, Benedikt Morbach, Ville Skyttä, Mark Vasilkov!)

* Fix alphabeticalattributes filter namespace bug. (#324) (Thank you, Will

Kahn-Greene!)

* Include license file in generated wheel package. (#350) (Thank you, Jon

Dufresne!)

* Fix annotation-xml typo. (#339) (Thank you, Will Kahn-Greene!)

* Allow uppercase hex chararcters in CSS colour check. (#377) (Thank you,

Komal Dembla, Hugo!)

0.999999999/1.0b10