Update README.md

README.md

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 Dataset descriptions:
 
-- lichess: 7GB of 16 million games from lichess's database. No elo filtering performed.
+- lichess_6gb: 6GB of 16 million games from lichess's database. No elo filtering performed. Comprised of games from lichess 2016-06 and 2017-05.
+- lichess_9gb: 9GB of games from lichess's database. No elo filtering performed. Comprised of gameds from lichess 2017-07 and 2017-08.
 - Lichess_gt_18k: ~4GB of games from lichess. Per OpenAI's weak to strong generalization paper, filtered to only include games where white is > 1800 ELO.
 - Stockfish: 4.5GB of games generated by White playing as Stockfish ELO 3200 against a range of Stockfish ELO 1300-3200 as black.
 - Lichess-stockfish mix: a 50 / 50 mix of > 1800 ELO lichess games and stockfish generated games