CI: Use dist xenial

effigies · effigies · commit 4b2f497ec374 · 2018-09-26T08:48:07.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -9,6 +9,8 @@ language: python
 # Run jobs on container-based infrastructure, can be overridden per job
 sudo: false
 
+dist: xenial
+
 cache:
   directories:
     - $HOME/.cache/pip
