try travis build with xenial (16.04)

.travis.yml

@@ -3,9 +3,9 @@ language: cpp
 matrix:
   include:
     - os: linux
-      dist: trusty
+      dist: xenial
       sudo: required
       before_install: "./CI/install-dependencies-linux.sh"
       before_script: "./CI/before-script-linux.sh"
 
-script: cd ./build && make -j4 && cd -
+script: cd ./build && make -j4 && cd -

CI/install-dependencies-linux.sh

@@ -3,7 +3,6 @@ set -ex
 
 # OBS Studio deps
 sudo add-apt-repository ppa:kirillshkrogalev/ffmpeg-next -y
-sudo add-apt-repository ppa:beineri/opt-qt532-trusty -y
 sudo apt-get -qq update
 sudo apt-get install -y \
         build-essential \