[PyUp] Scheduled weekly dependency update for week 43 (#27)
[PyUp] Scheduled weekly dependency update for week 43 (#27)

* Update flake8 from 3.4.1 to 3.5.0
* Update sphinx from 1.6.3 to 1.6.5
* Update tox from 2.8.1 to 2.9.1
* Update wheel from 0.29.0 to 0.30.0

jambonrose/markdown_subscript_extension