Temporarily use the old Travis image.

Use it until travis-ci/travis-ci#8891 is fixed.
rust-lang · Dec 12, 2017 · c0c26a6 · c0c26a6
1 parent 707d070
commit c0c26a6
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,7 @@
 language: shell
 sudo: required
 dist: trusty
+group: deprecated-2017Q4
 services:
   - docker