[gmime] Updated .travis.yml

[Jeffrey Stedfast <fejj src gnome org>]

commit ce1e2840422f6d0f2d81346ee9fecd4cf7083362
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Wed Dec 13 23:11:06 2017 -0500

    Updated .travis.yml

 .travis.yml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index e9cef08..2c24241 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-dist: precise
+dist: trusty
 language: c
 compiler:
   - gcc