add Stop() to Client

client/client.go

@@ -67,6 +67,8 @@ func NewClient(authorizationStateHandler AuthorizationStateHandler, options ...O
 
 	err := Authorize(client, authorizationStateHandler)
 	if err != nil {
+		client.Stop()
+
 		return nil, err
 	}
 
@@ -143,3 +145,8 @@ func (client *Client) GetListener() *Listener {
 
 	return listener
 }
+
+func (client *Client) Stop() {
+	client.Destroy()
+	client.jsonClient.Destroy()
+}