json: cannot unmarshal bool into Go struct field Event.metadata of type string

[thnk2wn]

Executing event, err := client.GetProjectEvent(org, project, eventId) returns this error:

json: cannot unmarshal bool into Go struct field Event.metadata of type string

Event metadata appears to be defined as:

Metadata *map[string]string json:"metadata,omitempty"`

Looking at the response, there can be non string data types like this boolean:

"metadata": {
  "display_title_with_tree_label": false
}

This change resolves the error:

Metadata *map[string]interface{} json:"metadata,omitempty"