[smuxi: 123/179] Travis-CI: use Ubuntu 14.04 (trusty) as build environment

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit c1701e60b3497bbd67ad11c48a9f77d3d6a432dd
Author: Mirco Bauer <meebey meebey net>
Date:   Mon Jan 9 16:48:10 2017 +0800

    Travis-CI: use Ubuntu 14.04 (trusty) as build environment
    
    By default Travis uses Ubuntu 12.04 (precise) if the version is not specified. [0]
    As the GTK# 2.12.40 backport is only available for trusty and xenial, bump the
    environment to trusty. xenial is not yet supported by Travis. [1]
    
     [0]: https://docs.travis-ci.com/user/trusty-ci-environment
     [1]: https://github.com/travis-ci/travis-ci/issues/5821

 .travis.yml |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index 8269684..94a76f8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: csharp
+dist: trusty
 
 before_install:
   - git submodule update --init --recursive