Remove custom puli

Author: sagikazarmark

.travis.yml

@@ -34,7 +34,6 @@ matrix:
 
 before_install:
     - travis_retry composer self-update
-    - wget https://github.com/puli/cli/releases/download/1.0.0-beta9/puli.phar && chmod +x puli.phar
 
 install:
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update