move conflict rule to require

Author: Tobion

composer.json

@@ -15,6 +15,7 @@
         "php": ">=5.6.0",
         "symfony/framework-bundle": "^3.2|^4",
         "symfony/console": "^3.2|^4",
+        "symfony/dependency-injection": "^3.3|^4",
         "symfony/options-resolver" : "^3.2|^4",
         "symfony/property-access": "^3.2|^4",
         "pagerfanta/pagerfanta": "^1.0.5",
@@ -36,9 +37,6 @@
         "symfony/yaml": "^3.2|^4",
         "friendsofphp/php-cs-fixer": "^2.2"
     },
-    "conflict": {
-        "symfony/dependency-injection": "<3.3"
-    },
     "suggest": {
         "enqueue/elastica-bundle": "The bundle adds extra features to FOSElasticaBundle bundle. Aimed to improve performance."
     },