symfony/validator v3.*

composer.json

@@ -16,7 +16,7 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=5.6.0",
-        "symfony/validator": "2.*",
+        "symfony/validator": "3.*",
         "deblan/csv": "v2.0.*"
     }
 }