v2.1.0 - Session Authentication re-added

Session Authentication is possible again.

• Requests can now be authenticated by using the user and session header and providing appropriate values in each header.
• Sessions can now be created by using the /session/auth endpoint
• Sessions can be extended by using the /session/extend endpoint
• Sessions are automatically extended when successfully authenticating against any endpoint using a session token

Full Changelog: v2.0.0...v2.1.0