Bump dist for travis to get tests passing

0b10011 · 0b10011 · commit 3ef1ef2181a5 · 2019-08-28T13:26:12.000-04:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: php
 
-dist: precise
+dist: xenial
 
 php:
     - 7.0
