[Checkins] [zopefoundation/zc.ngi] 5ce1d7: Stop using deprecated --use-mirrors

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zc.ngi
  Commit: 5ce1d742c1ef01dde7c82017b75d557d737c8b7e
      https://github.com/zopefoundation/zc.ngi/commit/5ce1d742c1ef01dde7c82017b75d557d737c8b7e
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2015-11-08 (Sun, 08 Nov 2015)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Stop using deprecated --use-mirrors