requests/requests-oauthlib — pull request #151 by alanjds (2014-10-09 16:01:44+00:00)
Title: [FIX] ImportError: cannot import name to_native_string

`requests` lib version should be >= 2.0.0 for `requests.utils.to_native_string` to be available

See: http://stackoverflow.com/a/24955127/798575