### Added
- **builder**: Add `ServiceBuilder::check_service` to check the request,
response, and error types of the output service. ([#576])
- **builder**: Add `ServiceBuilder::check_service_clone` to check the
output service can be cloned. ([#576])
### Fixed
- **spawn_ready**: Abort spawned background tasks when the `SpawnReady`
service is dropped, fixing a potential task/resource leak (#[581])
- Fixed broken documentation links ([#578])
[#576]: https://github.com/tower-rs/tower/pull/576
[#578]: https://github.com/tower-rs/tower/pull/578
[#581]: https://github.com/tower-rs/tower/pull/581