[Checkins] [zopefoundation/BTrees] 39a748: Fix test runner call.

[GitHub]

  Branch: refs/heads/coverage
  Home:   https://github.com/zopefoundation/BTrees
  Commit: 39a74849b2b21db07c63a73b82be3a204ba81c27
      https://github.com/zopefoundation/BTrees/commit/39a74849b2b21db07c63a73b82be3a204ba81c27
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-04-20 (Fri, 20 Apr 2018)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Fix test runner call.