nflseedR 2.0.1

• nflseedR_compute_results() correctly adjusts Elo difference for postseason games. (#54)
• nfl_standings() returns exit value consistent with nfl_simulations() if argument ranks = "DRAFT". (#56)
• nfl_standings_prettify() shows exit (if available). (#56)
• nfl_standings() now warns the user when the games argument includes both "season" and "sim" to avoid confusion. (#58)