Add a conflict on latest phpunit-bridge

composer.json

@@ -38,7 +38,8 @@
         "react/promise": "^1.2 || ^2.7"
     },
     "conflict": {
-        "symfony/console": "2.8.38"
+        "symfony/console": "2.8.38",
+        "symfony/phpunit-bridge": "3.4.40"
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^3.4",