def ban(user, message_days = 0, reason: nil)
      API::Server.ban_user(@bot.token, @id, user.resolve_id, message_days, reason)
    end
def ban(user, message_days = 0, reason: nil)
      API::Server.ban_user(@bot.token, @id, user.resolve_id, message_days, reason)
    end
Bans a user from this server.
 @param user [User, #resolve_id] The user to ban.
 @param message_days [Integer] How many days worth of messages sent by the user should be deleted.
 @param reason [String] The reason the user is being banned.