code: public Future<List<LeagueList>> getLeagues(String teamId) {
          return new ApiFuture<>(() -> handler.getLeagues(teamId));
      }
docs: Get a listing of leagues for the specified team
  @param teamId The id of the team
  @return A list of leagues
  @see <a href=https://developer.riotgames.com/api/methods#!/593/1860>Official API documentation</a>