Symfony Update + Fixed Deprecations

Author: Grzegorz Niewiadomski

Resources/config/services.yml

@@ -15,7 +15,7 @@ services:
 
     gatekeeper.voter:
         class: GateKeeperBundle\Voter\GateKeeper
-        arguments: [@gatekeeper]
+        arguments: ["@gatekeeper"]
         tags:
           - { name: security.voter }
 

composer.json

@@ -15,7 +15,7 @@
 	],
 	"require": {
 		"php": ">=5.3.3",
-		"symfony/symfony": ">=2.3",
+		"symfony/symfony": "~2.3|~3.0",
 		"docplanner/gatekeeper": "dev-master"
 	},
 	"autoload": {