Switch from trusty to xenial

schlessera · schlessera · commit 5c249516107c · 2019-11-25T08:42:12.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: false
-dist: trusty
+dist: xenial
 
 language: php
 php: 7.3
