Update .travis.yml

Author: urakozz

.travis.yml

@@ -13,6 +13,8 @@ before_script:
   - composer self-update
   - composer install --dev --no-interaction
   - mkdir -p build/logs
+  
+script: vendor/bin/phpunit --coverage-clover=build/logs/clover.xml
 
 after_script:
   - vendor/bin/test-reporter