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* api-change:``mediatailor``: Update mediatailor command to latest version
* api-change:``ec2``: Update ec2 command to latest version
* api-change:``shield``: Update shield command to latest version
* api-change:``securityhub``: Update securityhub command to latest version
* feature:retries: Add support for retry modes including ``standard`` and ``adaptive`` (boto/botocore`1972 <https://github.com/aws/aws-cli/issues/1972>`__)