[issue21446] Update reload fixer to use importlib instead of imp

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I would still fix it as I suspect there will be a burst of users of this come 2020 and at this point it won't be a compatibility issue going forward since 3.4 is so old. :)

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<https://bugs.python.org/issue21446>
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