1.1.0-pl
- Switched authentication from API tokens to the OAuth client credentials flow.
- Replaced the zendesk.user and zendesk.token system settings with zendesk.client_id, zendesk.client_secret, and zendesk.scope.
- Fixed user creation to reuse an existing user matched by email instead of always creating a new one.

1.0.3-pl
- Initial Release
