[Python-checkins] [python/cpython] 6dcd1d: Pin Sphinx to ~=1.5.6 in .travis.yml

[GitHub]

  Branch: refs/heads/Mariatta-bpo-30380
  Home:   https://github.com/python/cpython
  Commit: 6dcd1d5fe49f3e11049940328a8b23d7dfcd3c77
      https://github.com/python/cpython/commit/6dcd1d5fe49f3e11049940328a8b23d7dfcd3c77
  Author: Brett Cannon <brettcannon at users.noreply.github.com>
  Date:   2017-05-16 (Tue, 16 May 2017)

  Changed paths:
    M .travis.yml

  Log Message:
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  Pin Sphinx to ~=1.5.6 in .travis.yml