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