message: Update README.md - fix copy-paste mistake
diff: @@ -521,7 +521,7 @@ A US currency string, such as $21.25.
  The `JSON` scalar type represents JSON values as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).
  -> Uses [graphql-currency-scalars](https://github.com/abhiaiyer91/graphql-currency-scalars)
  +> Uses [graphql-type-json](https://github.com/taion/graphql-type-json)
  ### JSONObject
  