Upgrade Travis CI job to Ubuntu Xenial
-# Copyright 2018 Uber Technologies, Inc.
+# Copyright 2018-2019 Uber Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
language: c
os: linux
-dist: trusty
+dist: xenial
compiler:
- gcc
