Incorrect flag passed

A NSJSONReadingOptions was being passed to NSJSONSerialization dataWithJSONObject instead of a NSJSONWritingOptions constant.
The only NSJSONWritingOptions constant available is NSJSONWritingPrettyPrinted which does not make sense for productive code so I have passed zero.
See: https://developer.apple.com/library/ios/DOCUMENTATION/Foundation/Reference/NSJSONSerialization_Class/index.html#//apple_ref/c/tdef/NSJSONWritingOptions