update readme, for step1-optional

huangmingming

2023-01-30 32c5b3cafb4917dbfcae4f6f7d8c4d12a4f6eef4

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7