Release 2.2.0

See [https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v2.2.0](https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v2.2.0) for release details as well as our changelog ([https://github.com/bitcoindevkit/bdk-ffi/blob/master/CHANGELOG.md](https://github.com/bitcoindevkit/bdk-ffi/blob/master/CHANGELOG.md)).

Release 2.0.0

See https://github.com/bitcoindevkit/bdk-ffi/releases/tag/v2.0.0 for release details.