# File lib/rbot/config.rb, line 284
    def handle_add(m, params)
      key = params[:key].to_s.intern
      value = params[:value]
      unless @@items.has_key?(key)
        m.reply "no such config key #{key}"
        return
      end
      unless @@items[key].class <= BotConfigArrayValue
        m.reply "config key #{key} is not an array"
        return
      end
      begin
        @@items[key].add(value)
      rescue ArgumentError => e
        m.reply "failed to add #{value} to #{key}: #{e.message}"
        return
      end
      handle_get(m,{:key => key})
      m.reply "this config change will take effect on the next restart" if @@items[key].requires_restart
    end