From 5b8e0dc8ec7f5006cd2749977142dda284ea9bd9 Mon Sep 17 00:00:00 2001
From: tooomm <tooomm@users.noreply.github.com>
Date: Tue, 19 Dec 2017 00:17:31 +0100
Subject: [PATCH] add group key (#2967)

as announced here: https://blog.travis-ci.com/2017-12-01-new-update-schedule-for-linux-build-images
---
 .travis.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.travis.yml b/.travis.yml
index 73d7bcaf..d9f0bfeb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 sudo: required   # forces legacy build infrastructure
+group: travis_lts   # forces most stable build images
 
 language: cpp