Version 0.2.9 - 2023-11-06:
* Implement `std::error::Error` for `Error`.
Version 0.2.8 - 2023-07-26:
* Change links in `Cargo.toml` to `https`.
* Update to `base64` version `0.21`.
Version 0.2.7 - 2022-05-10
* Fix compilation with digest 0.10.2 and up.
Version 0.2.6 - 2022-01-30
* Update to hmac 0.12.
* Update to sha2 0.10.
Version 0.2.5 - 2021-10-03
* Update to hmac 0.11.
* Update to crypto-mac 0.11.
Version 0.2.4 - 2020-10-14
* Fix link to docs.rs in Cargo.toml.
* Update dependencies.
* Deprecate unsafe `decode` in favor of safe `decode_unverified` function.