Update .travis.yml (#188)

Build server is obviously upgraded to Ubuntu 16.04, travis build is failing because of outdated qt591 repository.
5 years ago · 77585cf20a
1 changed files with 2 additions and 2 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -9,7 +9,7 @@ matrix:
          packages: ['clang-3.7', 'g++-8']

 before_install:
- - sudo add-apt-repository ppa:beineri/opt-qt591-trusty -y
+ - sudo add-apt-repository ppa:beineri/opt-qt591-xenial -y
 - sudo apt-get update -qq
 - sudo apt-get install qt59base qt59websockets 
 - source /opt/qt59/bin/qt59-env.sh