[issue8896] email.encoders.encode_base64 sets payload to bytes, should set to str

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +l0nwlf, r.david.murray
versions:  -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8896>
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