[issue1539381] Add readinto method to StringIO and cStringIO

[Alan Justino]

Alan Justino <alan.justino at yahoo.com.br> added the comment:

Issued a related PR (https://github.com/python/cpython/pull/8451) to allow SpooledTemporaryFile to propagate `readinto` calls to TemporaryFile, BytesIO or StringIO.

Of this ones, only StringIO will fail.

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<https://bugs.python.org/issue1539381>
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