use xenial in travis to support python 3.7

samuelcolvin · samuelcolvin · commit 5f10fd1628f8 · 2019-06-16T13:15:18.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,3 +1,4 @@
+dist: xenial
 language: python
 python:
 - "2.7"
