Use new repository structure

Author: steevanb

composer.json

@@ -1,10 +1,10 @@
 {
-    "name": "phpbenchmarks/symfony-4-0",
+    "name": "phpbenchmarks/symfony",
     "license": "proprietary",
     "type": "project",
     "require": {
         "php": "^7.1.3",
-        "phpbenchmarks/symfony": "3.1.0",
+        "phpbenchmarks/symfony-common": "4.3.0",
         "symfony/console": "^4.0",
         "symfony/flex": "^1.0",
         "symfony/framework-bundle": "^4.0",