Merge pull request #230 from localheinz/feature/env

Enhancement: Specify environment variable in env section of Travis configuration

Author: gfosco

.travis.yml

@@ -10,6 +10,10 @@ php:
   - 7
   - hhvm
 
+env:
+  global:
+    - DISPLAY=:99.0
+
 cache:
   directories:
     - $HOME/.composer/cache
@@ -21,7 +25,6 @@ install:
   - composer install --no-interaction --prefer-source
 
 before_script:
-  - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
   - wget -q -t 3 http://selenium-release.storage.googleapis.com/2.45/selenium-server-standalone-2.45.0.jar
   - java -jar selenium-server-standalone-2.45.0.jar -log selenium.log &