update readme, for step1-optional

huangmingming

2023-01-30 32c5b3cafb4917dbfcae4f6f7d8c4d12a4f6eef4

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#!/bin/bash
if [[ $OSTYPE == 'darwin'* ]]; then
  conda install -c conda-forge -y pynini=2.1.5
else
  pip install pynini==2.1.5
fi