remove symfony/dependency-injection as is not used

Author: goetas

.travis.yml

@@ -24,7 +24,6 @@ before_install:
   - composer require --no-update symfony/expression-language "$SYMFONY_VERSION"
   - composer require --no-update --dev symfony/yaml "$SYMFONY_VERSION"
   - composer require --no-update --dev symfony/routing "$SYMFONY_VERSION"
-  - composer require --no-update --dev symfony/dependency-injection "$SYMFONY_VERSION"
 
 install:
     - composer install --no-interaction --prefer-dist

composer.json

@@ -29,7 +29,6 @@
         "doctrine/persistence": "^1.0",
         "symfony/yaml": "~3.0 || ~4.0 || ~5.0",
         "symfony/routing": "~3.0 || ~4.0 || ~5.0",
-        "symfony/dependency-injection": "~3.0 || ~4.0 || ~5.0",
         "pagerfanta/pagerfanta": "~1.0",
         "twig/twig": "^1.12 || ^2.0"
     },