def all free_to_play: false
      result = perform_request api_url("champions", "freeToPlay" => free_to_play)
      result["champions"].map { |c| DynamicModel.new c }
    end
def all free_to_play: false
      result = perform_request api_url("champions", "freeToPlay" => free_to_play)
      result["champions"].map { |c| DynamicModel.new c }
    end
Retrieve all champions

 See: https://developer.riotgames.com/api-methods/#champion-v3/GET_getChampions
 @param free_to_play [Boolean] filter param to retrieve only free to play champions
 @return [Array<Lol::DynamicModel>] an array of champions