Update .travis.yml

make phpunit ouput verbose to see whats wrong with skipped/risky tests

Author: cebe

.travis.yml

@@ -26,4 +26,4 @@ before_script:
   - ./tests/travis/memcache-setup.sh
   - cd tests
 
-script: phpunit --colors --no-globals-backup --exclude-group mssql,oci framework
+script: phpunit --verbose --colors --no-globals-backup --exclude-group mssql,oci framework