correct php min req

composer.json

@@ -13,7 +13,7 @@
 		}
 	],
 	"require": {
-		"php": ">=5.3",
+		"php": ">=5.4",
 		"composer/installers": "*",
 		"dereuromark/cakephp-shim": "0.4.*"
 	},