Please add field_name and value attributes for audit_events

```
+  # @return [String] The name of the field that changed
+  attribute :field_name, type: :string
+  # @return [String] The value of the changed field
+  attribute :value, type: :string
+  # @return [String] The previous value of the changed field
+  attribute :previous_value, type: :string
```

This worked for me on local testing to provide the information from those attributes.
