[gnome-commander] noop: Move to Ubuntu 18.04 build environment in Travis service

[Uwe Scholz <uwescholz src gnome org>]

commit 52fd21c0cf3b54d875892fd4e44959bdb6d4fc65
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Mon Jan 6 15:02:21 2020 +0100

    noop: Move to Ubuntu 18.04 build environment in Travis service

 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.travis.yml b/.travis.yml
index 8bf2ff32..1510bae9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo:     required
-dist:     trusty
+dist:     bionic
 language: cpp
 
 services: