Use the Ubuntu Xenial image on Travis

We need it for Python 3.7.
2019-03-18 14:36:10 -04:00 · 2019-03-18 14:36:10 -04:00 · f87959f6ba
commit f87959f6ba
parent 808f81f7e8
1 changed files with 3 additions and 2 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -1,11 +1,12 @@
 sudo: false
+dist: xenial
 language: python
 python:
  - "2.7"
  - "3.5"
  - "3.6"
-  - pypy
-  - pypy3
+  - pypy2.7-6.0
+  - pypy3.5-6.0
 install:
  - pip install -r requirements-travis.txt
  - pip install -e .