Fix CircleCI issues#172

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ManuelAlvarezC wants to merge 2 commits into

AIStream-Peelout:masterrfrom

ManuelAlvarezC:master

Commits on Oct 12, 2020

Add six>=1.13.0 to requirements
ManuelAlvarezC
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Commits on Oct 13, 2020

Pinned versions for torch==1.5.1 and certifi>=2020.6.20
ManuelAlvarezC
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