use travis apt installer
commit11a8bd56d05fc6587f4675365ff3de13706d2bd6
authorStephen <stephengroat@users.noreply.github.com>
Sat, 10 Nov 2018 15:40:24 +0000 (10 07:40 -0800)
committerGitHub <noreply@github.com>
Sat, 10 Nov 2018 15:40:24 +0000 (10 07:40 -0800)
treeea3252bbcfc4af4a7cd1e597850ddefbbd2e7117
parent16b5b278cab77d18b5b2c998b3191313a22b0142
use travis apt installer

should run a bit faster
.travis.yml