Buckup

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* Ensure public bucket policies are allowed before trying to write one

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* Allow control of public ACLs
* Add a ``--version`` command-line parameter

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* Set public access block for buckets with public files

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* Do not restrict boto3 version in the requirements.

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* Fix no credentials error being not handled.
* Require Python version of at least 3.4.

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* Update README.
* Update PyPI classifiers.
* Allow user to specify a list of paths that s3:getObject is set on rather than
doing it on the whole bucket (4).
* Set user access on bucket policy rather than IAM policy (11).
* Don't require non-essential permissions and specify them in the README file
(12).