fix travis build

.travis.yml

@@ -10,7 +10,7 @@ matrix:
     - php: 5.4
     - php: 5.5
     - php: 5.6
-      env: SCRUTINIZER=1
+      env: SCRUTINIZER=1 PHPUNIT_FLAGS="--coverage-clover=coverage.xml"
     - php: 7.0
       env: COMPOSER_FLAGS="--prefer-lowest"
     - php: 7.1
@@ -26,14 +26,15 @@ cache:
     - $HOME/.composer/cache
 
 before_script:
-  - composer self-update
+  - composer self-
+  - if [[ SCRUTINIZER != '1' ]]; then phpenv config-rm xdebug.ini || true; fi
   - composer update $COMPOSER_FLAGS --prefer-dist
 
 script:
   - stty cols 120
   - if [ "$CS_FIXER" == 1 ]; then wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.13.1/php-cs-fixer.phar && php php-cs-fixer.phar fix --dry-run --diff; fi
   - mkdir -p build/logs
-  - ./vendor/bin/phpunit --coverage-clover=coverage.xml
+  - ./vendor/bin/phpunit $PHPUNIT_FLAGS
 
 after_script:
   - if [ "$SCRUTINIZER" == 1 ]; then wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.xml; fi