bump dist to one supporting python 3.7

fabianhoward · fabianhoward · commit c43542b9092e · 2018-11-27T16:30:54.000Z
diff --git a/.travis.yml b/.travis.yml
@@ -4,7 +4,12 @@ dist: precise
 
 python:
   - "3.6"
-  - "3.7"
+
+matrix:
+  include:
+    - python: 3.7
+      dist: xenial
+      sudo: true
 
 before_install:
   - export TZ=Europe/Brussels
