Issues with aws-service-roles after upgrading to 2.3.0

#53 makes a change to completely ignore aws-service-roles. This raises an issue when you migrate to 2.3, it tries to create aws-service-roles as they are not "synced".

The fix I've implemented is to delete `aws-service-role/*` from our repo. I've documented this now in the releases page but we should do anything further?

cc @jacobbednarz

### Note

You should remove all roles under `iam/roles/aws-service-role/` as these are no longer managed by iamy