use verbose output on composer run

Author: ElectricMaxxx

.travis.yml

@@ -34,7 +34,7 @@ before_install:
 install:
   - phpenv config-add travis.php.ini
   - php -ini | grep memory_limit
-  - if [ "$COMPOSER_INSTALL" != "1" ]; then composer update --no-scripts --prefer-dist; else composer install --no-scripts --prefer-dist; fi
+  - if [ "$COMPOSER_INSTALL" != "1" ]; then composer update --no-scripts --prefer-dist -vvv; else composer install --no-scripts --prefer-dist -vvv; fi
 
 before_script:
   - cp config/fixtures/phpcr_${TRANSPORT}.yaml.dist config/phpcr.yaml