def user_is_admin?(user)
      Array(robot.config.robot.admins).include?(user.id)
    end
def user_is_admin?(user)
      Array(robot.config.robot.admins).include?(user.id)
    end
Checks if a user is an administrator.
 @param user [User] The user.
 @return [Boolean] Whether or not the user is an administrator.