Specify Ubuntu Xenial 16.04

2019-05-23 17:33:34 -05:00 · 2019-05-23 17:33:34 -05:00 · 2faff516bf
commit 2faff516bf
--- a/.travis.yml
+++ b/.travis.yml
@ -1,3 +1,4 @@
+dist: xenial
 language: python
 sudo: required
 cache: pip