[12gevmoller_sim] [JeffersonLab/remoll] 12db86: Update .travis.yml

[Wouter Deconinck]

  Branch: refs/heads/bugfix-docker-exec-syntax
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  Commit: 12db86bb80a13550819ba7657a803fa3eadab548
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-03-16 (Sat, 16 Mar 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update .travis.yml

At some point we're going to get docker exec syntax right...