Change audited-activerecord to audited, update to 4.3.0
The audited-activerecord gem is no longer maintained and has been rolled into audited, as of version 4.3.0.
The dependency on audited-activerecord should be changed to audited. Version 4.3.0 also deprecates the
Audited.audit_class accessors, as it no longer supports multiple backends - it should be replaced by Audited::Audit.