Added boto3 dependency. (#9)
Added boto3 dependency. (#9)

Summary:
boto3 is needed for s3 path handler.

Pull Request resolved: https://github.com/fairinternal/iopath/pull/9

Reviewed By: girifb

Differential Revision: D32669531

Pulled By: sujitoc

fbshipit-source-id: 10f44007331a6a282abaed8d1da89f4e6ba1fe1b

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