allow newer versions of willdurand/negotiation

Author: lsmith77

composer.json

@@ -25,7 +25,7 @@
         "psr/log":                        "~1.0",
         "symfony/framework-bundle":       "~2.2",
         "doctrine/inflector":             "1.0.*",
-        "willdurand/negotiation":         "~1.2.0",
+        "willdurand/negotiation":         "~1.2",
         "willdurand/jsonp-callback-validator": "~1.0"
     },