Travis CI works correctly, but Coveralls doesn't see the builds

I have a repository on Github, a PHP Symfony app with a PHPunit test suite (https://github.com/antodippo/ccmusicsearch), and Travis CI is correctly checking the build every time I push (https://travis-ci.org/antodippo/ccmusicsearch/builds).

I linked to a Coveralls account to my Travis and Github account, and I configured my .travis.yml file this way:

language: php

php:
  - 5.5
  - 5.6

before_script:
  - composer self-update
  - composer install

script:
  - mkdir -p build/logs
  - phpunit -c app/phpunit.xml.dist

after_success:
  - bin/coveralls -v

and I put this lines in my phpunit.xml.dist:

<logging>
    <log type="coverage-clover" target="build/logs/clover.xml"/>
</logging>

but Coveralls stills says that there have been no build (https://coveralls.io/github/antodippo).

What am I forgetting?