Release 0.12

[ryanhiebert]

• Fix reading envlist from setup.cfg (Fix reading envlist from setup.cfg #110).
  thanks to @voronind for the pull request.
• Add docs and tests to sdist (MANIFEST.in: Add docs and tests #121).
  thanks to @jayvdb for the pull request.
• Release an sdist in addition to the wheel.

[codecov-io]

Codecov Report

Merging #123 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #123   +/-   ##
=======================================
  Coverage   88.26%   88.26%           
=======================================
  Files           5        5           
  Lines         213      213           
  Branches       48       48           
=======================================
  Hits          188      188           
  Misses         21       21           
  Partials        4        4

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