removed old option flag

Author: rok

.travis.yml

@@ -5,6 +5,6 @@ php:
   - 7.3
 
 before_script:
-  - composer install --dev --prefer-dist --no-ansi --no-interaction --no-progress --no-scripts --no-suggest
+  - composer install --prefer-dist --no-ansi --no-interaction --no-progress --no-scripts --no-suggest
 
 script: phpunit