travis: use the previous image version ...

... in attempt to figure out why it no longer works.
2017-12-23 01:02:34 +00:00 · 2017-12-23 01:02:34 +00:00 · 6ab67a54de
commit 6ab67a54de
parent cb1f64ef3a
1 changed files with 2 additions and 0 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -2,6 +2,8 @@ language: c

 dist: trusty

+group: deprecated-2017Q4
+
 before_install: ./travis-install.sh

 script: ./travis-build.sh