DeprecationWarning

[bobcyw]

python3.4/site-packages/botocore/auth.py:455: DeprecationWarning: encodestring() is a deprecated alias, use encodebytes()

Hi, when I use S3's "ListObjects" operation, I meet such a warning.

[bobcyw]

https://docs.python.org/3.4/library/base64.html#base64.encodestring

[jamesls]

Fixed via #320