function get_instance()
 {
     if (!isset(self::$instance)) {
         self::$instance = new MailChimpSettings();
         self::$instance->init();
     }
     return self::$instance;
 }
 /**
  * Initialize MailChimp Settings
  *
  * @since 0.0.1
  */
 function mailchimp_tools_admin_init_settings()
 {
     MailChimpSettings::get_instance();
 }