Breaking changes in Cadence

Hello Flow SDK maintainer! We need your help updating this repository ASAP. Please check the last change[ in this post](https://forum.onflow.org/t/breaking-changes-coming-with-secure-cadence-release/3052) about breaking changes coming along with the release of Secure Cadence and read [the documentation](https://docs.onflow.org/cadence/json-cadence-spec/) about this specific change.