Use Ubuntu Bionic for travis-ci

diff --git a/.travis.yml b/.travis.yml
index ded49335b2bb91c076f2d7cf2bd7c3c546b44987..0f801cb71121a93434668d6d59474813e2628fc0 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 sudo: false
 language: ruby
 sudo: false
 language: ruby

+dist: bionic

 cache: bundler
 services:
   - docker
 cache: bundler
 services:
   - docker