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

[Jelle Zijlstra]

Jelle Zijlstra added the comment:

I couldn't find references in the docs to clarify what version of 3.x 2to3 targets, but it seems reasonable to me that it produces code targeted to the version of CPython it was bundled with. imp is deprecated and presumably will be removed later in 3.x, so it's better not to migrate people's Python 2 code to use it.

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nosy: +Jelle Zijlstra

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