build(deps): update error-chain requirement to ^0.12.0
build(deps): update error-chain requirement to ^0.12.0

Updates the requirements on [error-chain](https://github.com/rust-lang-nursery/error-chain) to permit the latest version.
- [Release notes](https://github.com/rust-lang-nursery/error-chain/releases)
- [Changelog](https://github.com/rust-lang-nursery/error-chain/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang-nursery/error-chain/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
michiel/jsonapi-rust