Please consider also adding the equivalent action (there is a separate ticket for that). This way we can deal with roles in both ways.
The same would be useful for capabilities, not only roles.
Customers can have multiple roles and subscription-based sites like mine tie memberships levels to roles, so I suggest the trigger will manage all these situations: role added, role deleted, role changed
This would be a great add guys. What would even make it more powerful is if you could also capture the previous role and the new role so that you could base logic off that.