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* feature:Dependencies: Relax version constraint of ``futures`` to support version 3.x.
* feature:Resources: Allow ``config`` object to be provided when creating resources (`issue 325 <https://github.com/boto/boto3/pull/325>`__)
* feature:Documentation: Add docstrings for resource collections and waiters (`issue 267 <https://github.com/boto/boto3/pull/267>`__, `issue 261 <https://github.com/boto/boto3/pull/261>`__)