Removed dev flag from Travis file

Author: Swader

.travis.yml

@@ -9,7 +9,7 @@ php:
 
 before_script:
   - travis_retry composer self-update
-  - travis_retry composer install --no-interaction --prefer-source --dev
+  - travis_retry composer install --no-interaction --prefer-source
 
 script:
   - phpunit --coverage-text --coverage-clover=coverage.clover