code: def leagues(summoner, optional={})
      region = optional[:region] || @sightstone.region
      id = if summoner.is_a? Summoner
        summoner.id
      else
        summoner
      end
      
      uri = "https://prod.api.pvp.net/api/lol/#{region}/v2.3/league/by-summoner/#{id}"
      response = _get_api_response(uri)
      _parse_response(response) { |resp|
        data = JSON.parse(resp)
        leagues = []
        data.each do |league|
          leagues << League.new(league)
        end
        if block_given?
          yield leagues
        else
          return leagues
        end
      }
    end
docs: Provides league information of a summoner
   @param [Summoner, Integer] summoner
   @param optional [Hash] optional arguments: :region => replaces default region
   @return [Array<League>] an array of all leagues the summoner and his teams are in