[Python-checkins] [python/cpython] 5c7b8f: Backport recent .travis.yml changes (#308)

[GitHub]

  Branch: refs/heads/3.6
  Home:   https://github.com/python/cpython
  Commit: 5c7b8f423ab1de6221351036ac4e139861a2f4a6
      https://github.com/python/cpython/commit/5c7b8f423ab1de6221351036ac4e139861a2f4a6
  Author: Berker Peksag <berker.peksag at gmail.com>
  Date:   2017-02-26 (Sun, 26 Feb 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Backport recent .travis.yml changes (#308)

Backported changes from master:

* b52260d8bf392aa04c48b8c2467a4c034184de86
* 984eef7d6d78e1213d6ea99897343a5059a07c59
* 532519770dea5d353f0b0d718c8881a15c7542df
* 91b0e7d0ca7c59df28f6a6fc1e8eb86a3925b76c