code: function settingsRequestError( state = false, action ) {
  	switch ( action.type ) {
  		case WOOCOMMERCE_MAILCHIMP_SETTINGS_REQUEST_SUCCESS:
  		case WOOCOMMERCE_MAILCHIMP_SETTINGS_REQUEST_FAILURE:
  			const error =
  				WOOCOMMERCE_MAILCHIMP_SETTINGS_REQUEST_FAILURE === action.type ? action.error : false;
  			return error;
  	}
  
  	return state;
  }
docs: Updates state with settings request error
  Holds information only for latest request
  
  @param  {Object} state  Current state
  @param  {Object} action Action
  @return {Object}        Updated state