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* enhancement:Stubber: [``botocore``] Added the ability to add items to response metadata with the stubber.
* api-change:``sts``: [``botocore``] Update sts client to latest version
* api-change:``route53``: [``botocore``] Update route53 client to latest version
* feature:``s3``: [``botocore``] Default to virtual hosted addressing regardless of signature version (boto/botocore`1387 <https://github.com/boto/botocore/issues/1387>`__)