update to version 2.12.1
* get_endpoint should return None when no version found

update to version 2.12.0
* Allow identity plugins to discover relative version urls
* Disables TCP_KEEPCNT when using Windows Subsystem for Linux
* User-agent header shouldn't start with a space
* Add tests for user-agent with odd sys.argv
* add status code 308 to _REDIRECT_STATUSES
* Update the home-page in setup.cfg
* Updated from global requirements

- update to version 2.11.0
* Add tests for YamlJsonSerializer
* Add missing class name to tuple of public objects
* Fix arguments to _auth_required()
* Don't include openstack/common in flake8 exclude list
* Fix the doc error in "using-session"
* Improve authentication plugins documentation
* Use assertEqual() instead of assertDictEqual()
* Updated from global requirements
* Correctly report available for ADFS plugin

- update to 2.10.0:
* Lazy load oauthlib for plugin loading
* oidc: add missing 'OidcAccessToken' to __all__
* oidc: implement client_credentials grant type
* Fix ECP doc link in Saml2 Password class doc
* Updated from global requirements
* Fix link for "extras dependencies" in extras doc