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* api-change:``sagemaker``: Update sagemaker client to latest version
* api-change:``chime``: Update chime client to latest version
* api-change:``transfer``: Update transfer client to latest version
* api-change:``ec2``: Update ec2 client to latest version
* feature:Python: Dropped support for Python 2.6 and 3.3.
* api-change:``workspaces``: Update workspaces client to latest version
* api-change:``rds``: Update rds client to latest version