update distribution to xenial

mmcky · mmcky · commit 7cdd179a7b0e · 2019-07-12T13:23:22.000+10:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,6 +5,7 @@
 
 sudo: false        #Use new Container Infrastructure
 language: python
+dist: xenial
 
 cache:
   pip: true
