change ubuntu trusty -> xenial

GerryFerdinandus · GerryFerdinandus · commit c9c0d82859b4 · 2019-04-27T11:16:10.000+02:00
trusty (14.04) is no longer suported
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@
 language: generic
 
 sudo: required
-dist: trusty
+dist: xenial
 
 env:
   global:
