Remove conflict from composer.json

Author: bbatsche

composer.json

@@ -14,9 +14,6 @@
         "symfony/dependency-injection": "^3.3||^4.3",
         "symfony/process": "^2.1||^4.1"
     },
-    "conflict": {
-        "symfony/process": "^4.2"
-    },
     "require-dev": {
         "phpmd/phpmd": "@stable",
         "phpunit/phpunit": "^6.2",