One more changelog fix
## [Unreleased]
(Please put changes here)
+- Remove unused import
- Updated AWS-CREDENTIALS.md to address https://github.com/rusoto/rusoto/issues/1597
- Fixed SNS API's attributes and value keyword https://github.com/rusoto/rusoto/pull/1591
- Adding support for web identity provider, which enables IAM roles for Kubernetes service accounts.
