def close_connection
      if connected?
        get.connect.close.call
      else
        return false
      end
    rescue Emailvision::Exception => e
    ensure
      invalidate_token!
      not connected?
    end
def close_connection
      if connected?
        get.connect.close.call
      else
        return false
      end
    rescue Emailvision::Exception => e
    ensure
      invalidate_token!
      not connected?
    end
Logout from Emailvision API

 @return [Boolean] true if the connection has been destroyed