.travis.yml: use xenial for Python 3.5

OddBloke · OddBloke · commit 7e02cb425121 · 2019-08-11T08:21:47.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -11,6 +11,7 @@ matrix:
         - python: 3.5
           env:
               - TOXENV=py35
+          dist: xenial
         - python: 3.6
           env:
               - TOXENV=py36
