Add missing copyright headers (#299)

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

pub mod provider;

use smithy_http::property_bag::PropertyBag;

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

use std::error::Error;

use std::fmt;

use std::fmt::{Debug, Display, Formatter};

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

pub mod user_agent;

use smithy_http::result::SdkError;

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

pub mod conn;

mod retry;

#[cfg(feature = "test-util")]

/*

 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

 * SPDX-License-Identifier: Apache-2.0.

 */

//! AWS Signature Authentication Package

//!

//! In the future, additional signature algorithms can be enabled as Cargo Features.