bpo-43487: Add unicode dundermethod fixer to 2to3

[bartbroere]

While porting a (Django) code base recently, using 2to3, I missed the conversion from __unicode__ to __str__. I have created my own 2to3 fixer, which might be useful for other people.

If it's not useful enough to be included in lib2to3, or has side effects that I did not foresee, please let me know :-)

https://bugs.python.org/issue43487

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[bartbroere]

As discussed in the Python bugtracker: https://bugs.python.org/issue43487

Closing as lib2to3 has been deprecated. I might publish the new fixer somewhere else later.