Fix travis-ci

Author: qeq66

.travis.yml

@@ -17,6 +17,9 @@ before_install:
 install:
   - travis_retry composer install --prefer-dist --dev --no-suggest --no-interaction
 
+before_script:
+  - export XDEBUG_MODE=coverage
+
 script:
  - vendor/bin/phpunit --version
  - mkdir -p build/logs