Fix str exception on for Python 3

Closed Andi Vajda requested to merge github/fork/cenkalti/patch-1 into master

Created by: cenkalti

In Python 3, os.environ values are already in str type. There is no need to wrap them with str function again.

When you do str(s, 'ascii') on a string it raises an exception:

TypeError: decoding str is not supported

I have removed the str() wrapper to fix this issue.

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