modify onnx readme

lyblsgo

2023-04-26 25e1e4f57f6f2e0327e885038eaea2ddf6bad2a1

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