Removed bionic dist specifier

Author: Simon Hofmann

.travis.yml

@@ -5,19 +5,16 @@ cache: npm
 matrix:
   include:
     - os: linux
-      dist: bionic
       node_js: "10"
     - os: osx
       osx_image: xcode11
       node_js: "10"
     - os: linux
-      dist: bionic
       node_js: "11"
     - os: osx
       osx_image: xcode11
       node_js: "11"
     - os: linux
-      dist: bionic
       node_js: "12"
     - os: osx
       osx_image: xcode11
@@ -43,13 +40,7 @@ before_install:
   - node --version
   - npm --version
 
-  - if [[ $TRAVIS_OS_NAME == "linux" ]]; then export CXX=g++-4.8; fi
-  - $CXX --version
-
-# before_script:
-  # Start xvfb
-  # - if [[ $TRAVIS_OS_NAME == "linux" ]]; then export DISPLAY=:99.0; fi
-  # - if [[ $TRAVIS_OS_NAME == "linux" ]]; then sh -e /etc/init.d/xvfb start; fi
+  - if [[ $TRAVIS_OS_NAME == "linux" ]]; then export CXX=g++-4.8 && $CXX --version; fi
 
 install: true