v1.75.0

AWS v1.75.0

Diff since v1.74.1

Closed issues:

• Document backends (HTTP and Downloads) (#426)
• S3.get_object sometimes returning incomplete ranged data without error (#515)
• JSON parser error when putting CloudWatch log events (#537)
• Interest in wrapping the AWS Common Runtime (#540)

Merged pull requests:

• add docs for backends (#538) (@ericphanson)
• translate Retry to Base.retry (#548) (@ericphanson)
• Consume buffer when creating AWSException (#557) (@quinnj)