[xiphos-source] [crosswire/xiphos] 753936: Update .travis.yml to fix all builds

[Greg Hellings]

  Branch: refs/heads/master
  Home:   https://github.com/crosswire/xiphos
  Commit: 753936d391c8fd6192ae109c0ff4c7c504fc44d3
      https://github.com/crosswire/xiphos/commit/753936d391c8fd6192ae109c0ff4c7c504fc44d3
  Author: Gregory Hellings <greg.hellings at gmail.com>
  Date:   2020-03-16 (Mon, 16 Mar 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update .travis.yml to fix all builds