Update oauthlib to 3.1.1

[pyup-bot]

This PR updates oauthlib from 3.1.0 to 3.1.1.

Changelog

3.1.1

------------------
OAuth2.0 Provider - Bugfixes

* 753: Fix acceptance of valid IPv6 addresses in URI validation

OAuth2.0 Client - Bugfixes

* 730: Base OAuth2 Client now has a consistent way of managing the `scope`: it consistently
 relies on the `scope` provided in the constructor if any, except if overridden temporarily
 in a method call. Note that in particular providing a non-None `scope` in
 `prepare_authorization_request` or `prepare_refresh_token` does not override anymore
 `self.scope` forever, it is just used temporarily.
* 726: MobileApplicationClient.prepare_request_uri and MobileApplicationClient.parse_request_uri_response,
 ServiceApplicationClient.prepare_request_body,
 and WebApplicationClient.prepare_request_uri now correctly use the default `scope` provided in
 constructor.
* 725: LegacyApplicationClient.prepare_request_body now correctly uses the default `scope` provided in constructor

OAuth2.0 Provider - Bugfixes
* 711: client_credentials grant: fix log message
* 746: OpenID Connect Hybrid - fix nonce not passed to add_id_token
* 756: Different prompt values are now handled according to spec (e.g. prompt=none)
* 759: OpenID Connect - fix Authorization: Basic parsing

General
* 716: improved skeleton validator for public vs private client
* 720: replace mock library with standard unittest.mock
* 727: build isort integration
* 734: python2 code removal
* 735, 750: add python3.8 support
* 749: bump minimum versions of pyjwt and cryptography

Links

• PyPI: https://pypi.org/project/oauthlib
• Changelog: https://pyup.io/changelogs/oauthlib/
• Repo: https://github.com/oauthlib/oauthlib

[codecov-commenter]

Codecov Report

Merging #101 (4f0e762) into master (026f32c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #101   +/-   ##
=======================================
  Coverage   58.96%   58.96%           
=======================================
  Files          11       11           
  Lines         368      368           
  Branches       49       49           
=======================================
  Hits          217      217           
  Misses        144      144           
  Partials        7        7           

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[pyup-bot]

Closing this in favor of #127