code: def champions(optional={})
      region = optional[:region] || @sightstone.region
      free_to_play = optional[:free_to_play] || false
      uri = "https://prod.api.pvp.net/api/lol/#{region}/v1.1/champion"
      response = _get_api_response(uri, {'freeToPlay' => free_to_play})
  
      _parse_response(response) { |resp|
        data = JSON.parse(resp)
        champions = []
        data['champions'].each do |champ|
          champions << Champion.new(champ)
        end
        if block_given?
          yield champions
        else
          return champions
        end
      }
    end
docs: call to get champions
   @param optional [Hash] optional arguments: :region => replaces default region, :free_to_play => boolean (only free to play champs if true)
   @return [Array<Champion>] array of champs