krb5 commit: Update Travis CI distribution to Xenial

[Greg Hudson]

https://github.com/krb5/krb5/commit/e71a52662323d1055076a95060f28a6e8963788c
commit e71a52662323d1055076a95060f28a6e8963788c
Author: Michael Mattioli <mmattioli at users.noreply.github.com>
Date:   Tue Apr 18 21:46:59 2017 -0400

    Update Travis CI distribution to Xenial

 .travis.yml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 59d1da5..a503cd6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: c++
 
 sudo: required
 
-dist: trusty
+dist: xenial
 
 matrix:
   include: