Bump alabaster from 0.7.11 to 0.7.12

[dependabot-preview]

Bumps alabaster from 0.7.11 to 0.7.12.

Changelog

Sourced from alabaster's changelog.

=========
Changelog

• :release:0.7.12 <2018-10-02>

• 🐛- On some browsers/platforms, 'badge'-style sidebar elements were
  displaying dotted underlines. This was unintentional and explicit styling has
  been added to remove them. Credit to Steven Loria.

• :support:- backported Reorganize the :doc:customization page </customization> to break up the now rather long list of "variables and
  feature toggles" into additional sections; includes alphabetizing those
  lists, to make it a bit easier to find docs for a specific setting.

• :feature:132 backported (partially via :issue:143) Add a generic donation
  badge/url option (visually powered by https://shields.io/) as well as a
  service-specific donation option for OpenCollective <https://opencollective.com>_.

  We expect this to be followed-up on later with more service-specific options
  for services like Patreon. Thanks to Melanie Crutchfield for the report and
  Steven Loria for the initial patch.

• 🐛128 Remove Gittip/Gratipay output from the donate.html sidebar
  component, since the actual service has been insolvent since 2017. The
  configuration options remain in place for the time being (to avoid breaking
  backwards compatibility) but no longer do anything. Thanks to Joe Alcorn for
  the report / original patchset.

  .. note::
  See the changelog entry for #132, which re-introduces a more generic
  donation sidebar framework.

• :feature:142 backported Add a tidelift_url option, which when set
  (default is None/unset) adds a small text snippet to the
  donate.html sidebar component, linking to the given URL string. Thanks
  to Steven Loria for the patch.

• 🐛141 Fix a typo in the code-block font family, which incorrectly
  specified Deja Vu Sans Mono instead of DejaVu Sans Mono. This would
  primarily impact systems lacking the first two fonts (Consolas and
  Menlo) such as Linux desktops. Thanks to Ilya Trukhanov for catch &
  patch.

• :release:0.7.11 <2018-06-18>

• 🐛73 Clean up some problematic font issues:

  • Remove the outright broken Goudy Old Style, plus other mostly Adobe-only
    fonts, from the font_family config setting; it is now simply Georgia, serif which is what the majority of users were rendering anyways.
  • Clear out the default value of head_font_family (which contained
    Garamond, a nice but also Adobe only font)
  • Set head_font_family so it falls back to the value of font_family
    unless a user has explicitly set it themselves.

... (truncated)

Commits

• 7d94bd5 Cut 0.8.0
• e1ff49a Install ourselves in dev-requirements.txt, not just travis.ci
• a3c4efd Increment version to prep for release and debug an RTD issue
• f09f526 Remove/fix donate/donation.html references
• a6af1a5 Implement #132 and #143
• 098d5e9 Missed a spot in customization docs
• 14586fc Shuffle and sort some of theme.conf
• 7fcc9bb Reoganize customization page a bunch.
• a5496b2 Remove underlines from badge elements.
• d7c124c Remove Gittip/Gratipay functionality.
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 94.528% when pulling 12a05e8 on dependabot/pip/alabaster-0.7.12 into f3a2e62 on master.