Update README.md

Update README.md

v2: 2M training, dropout 0.1, full-corpus tokenizer — chrF 51.65 case-normalized (was 45.62)

v2: 2M training, dropout 0.1, full-corpus tokenizer — chrF 48.93 (was 45.62)

Upload en-ms Transformer (6+2 Tied, 16K BPE, chrF 45.62)

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