bpo-39035: travis: Update image to xenial (GH-17622)

diff --git a/.travis.yml b/.travis.yml
index 8250fd91b3d9a41ea7fc7e547068e64ac9fbfab7..0c4c28e8295bc6816d481cdaeebe134f9f7ba096 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,5 @@
 language: c
-dist: trusty
-sudo: false
-group: beta
+dist: xenial
 
 # To cache doc-building dependencies and C compiler output.
 cache: