update travis CI options

.travis.yml

@@ -14,35 +14,5 @@ matrix:
     - os: osx
       env: ARCH=x86
 
-# Sort out packages
-install:
-  - |
-    if [ $TRAVIS_OS_NAME == osx ]
-    then
-      brew update
-      brew install sdl2
-    elif [ $TRAVIS_OS_NAME == linux ]
-    then
-      if [ $ARCH == x86 ]
-      then
-        sudo dpkg --add-architecture i386
-        sudo apt-get update
-        sudo apt-get install -y gcc-multilib libgl1-mesa-glx:i386 libfreetype6:i386 libsdl2-2.0-0:i386
-      else
-        sudo apt-get update
-        sudo apt-get install -y libfreetype6 libsdl2-2.0-0
-      fi
-    fi
-
-# Start a virtual x-server.
-before_script:
-  - |
-    if [ $TRAVIS_OS_NAME == linux ]
-    then
-      export DISPLAY=:99.0
-      sh -e /etc/init.d/xvfb start
-      sleep 3
-    fi
-
 script:
   - dub test --arch=$ARCH