This crate has been retired, we recommend you stop using it **IMMEDIATELY**
in favor of
[google-cloud-auth](https://crates.io/crates/google-cloud-auth).
We will not fix bugs, or make any improvements to the `gcp-sdk-*` crates. All
development continues under the `google-cloud-*` prefix, where we do plan to
make improvements, continue support, and eventually release 1.0 versions with
stable APIs.