Log Message:
py-requests-oauthlib: update to 1.0.0.

v1.0.0 (4 June 2018)
++++++++++++++++++++

- **Removed support for Python 2.6 and Python 3.3.**
  This project now supports Python 2.7, and Python 3.4 and above.
- Added several examples to the documentation.
- Added plentymarkets compliance fix.
- Added a ``token`` property to OAuth1Session, to match the corresponding
  ``token`` property on OAuth2Session.