codemod Test Python 3.6 on Travis

This PR also has a small fix for Python 3 compatibility.

Jun 08 '18 03:06 rouge8

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Jun 08 '18 03:06 facebook-github-bot

Not sure why Travis isn't triggering, but I have a passing build on my fork: https://travis-ci.com/rouge8/codemod/builds/75714851

Jun 08 '18 03:06 rouge8

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