Update composer.json

composer.json

@@ -8,7 +8,8 @@
     "authors": [
         {
             "name": "Thomas Rabaix",
-            "email": "thomas.rabaix@sonata-project.org"
+            "email": "thomas.rabaix@sonata-project.org",
+            "homepage": "http://sonata-project.org"
         },
         {
             "name": "Sonata Community",