- Changed serialization of `NaiveDate` when using the optional `chronos` support.
**Note:** while this is not a Rust breaking change, if you relied on the serialization format (perhaps by storing serialized data in a database or making asumptions in your client code written in another language) it could be a breaking change for your application.
- Error responses no longer have a _data_ field, instead, error details are stored in the _extensions_ field
**Note:** while this is a breaking change, it is a necessary one to better align with the latest [GraphQL June 2018](https://facebook.github.io/graphql/June2018/#sec-Errors) specification, which defines the reserved _extensions_ field for error details.