Update travis config.

Author: mikebronner

.gitignore

@@ -2,3 +2,4 @@
 /vendor
 composer.lock
 .phpunit.result.cache
+phpunit.xml

.travis.yml

@@ -28,7 +28,7 @@ before_script:
 
 script:
   - mkdir -p build/logs
-  - php vendor/bin/phpunit -c phpunit.xml  --coverage-clover build/logs/clover.xml
+  - php vendor/bin/phpunit -c phpunit.xml.dist  --coverage-clover build/logs/clover.xml
 
 after_success:
   - travis_retry php vendor/bin/php-coveralls -v