v2.3.0

Changed

• Make permission and role queries more performant by utilizing relation caching - #22, #23 - 536e060, ed4f989, 7a1c0a0
• Introduction of pivot models for flushing relation caching - #22, #23 - 536e060

Fixed

• Return false when an empty string or null is given to hasRole() / hasPermission() - 7a1c0a0, 9a31da9