update readme (#587)

Xian Shi

2023-06-02 6caf126b015ae272ce3e639939b3e2af6ef44986

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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