Backport change from aws-sdk-rust (#622)

- :bug: Correctly encode HTTP Checksums using base64 instead of hex. Fixes aws-sdk-rust#164. (#615)

- (When complete) Add profile file provider for region (#594, #xyz)

- Overhaul serialization/deserialization of numeric/boolean types. This resolves issues around serialization of NaN/Infinity and should also reduce the number of allocations required during serialization. (#618)

- Update SQS example to clarify usage of FIFO vs. standard queues (#622, @trevorrobertsjr)

## v0.18.1 (July 27th 2021)

* Remove timestreamwrite and timestreamquery from the generated services (#613)

use std::process::exit;

/// Sends a message to and receives the message from a queue.

/// Sends a message to and receives the message from a FIFO queue.

#[tokio::main]

async fn main() -> Result<(), sqs::Error> {

    tracing_subscriber::fmt::init();

        .send_message()

        .queue_url(&queue_url)

        .message_body("hello from my queue")

        // message group id required for FIFO Queue

        // comment out ".message_group_id("MyGroup")" for standard queues

        .message_group_id("MyGroup")

        .send()

        .await?;