Removed simple phpunit line

Author: Nyholm

.travis.yml

@@ -58,7 +58,6 @@ install:
     # To be removed when this issue will be resolved: https://github.com/composer/composer/issues/5355
     - if [[ "$COMPOSER_FLAGS" == *"--prefer-lowest"* ]]; then composer update --prefer-dist --no-interaction --prefer-stable --quiet; fi
     - composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction
-    - ./vendor/bin/simple-phpunit install
 
 script:
     - composer validate --strict --no-check-lock