fix path error

Author: inhere

.travis.yml

@@ -16,7 +16,7 @@ before_script:
 
 script:
     # - phpunit --coverage-clover clover.xml
-    - php /vendor/bin/phpunit --coverage-clover clover.xml
+    - php vendor/bin/phpunit --coverage-clover clover.xml
 
 after_success:
     - vendor/bin/php-coveralls --coverage_clover=clover.xml --json_path=coveralls-upload.json -v