[docs] [issue21071] struct.Struct.format is bytes, but should be str

[STINNER Victor]

STINNER Victor added the comment:

> It would be backwards incompatible to change, though.

I'm in favor of breaking the compatibility with Python 3.4 and return the format as an Unicode string.

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nosy: +haypo

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<http://bugs.python.org/issue21071>
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