Ensure that we also test the code after a composer update

Author: mvriel

.travis.yml

@@ -8,12 +8,15 @@ php:
 matrix:
   allow_failures:
     - php: hhvm
+
 cache:
   directories:
     - $HOME/.composer/cache
 
 script:
  - vendor/bin/phpunit --coverage-clover=coverage.clover -v
+  - composer update --no-interaction --prefer-source
+  - vendor/bin/phpunit -v
 
 before_script:
  - composer install --no-interaction