Update composer.json

Author: nilportugues

composer.json

@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": ">=5.5.0",        
-        "nilportugues/serializer": "~1.0",
+        "nilportugues/serializer": "~1.1",
         "psr/http-message": "~1.0",
         "zendframework/zend-diactoros": "^1.1.0"
     },