Update README.md (#2487)

zhifu gao

2025-04-22 2c2fb5e1eb1185a081e3507c2aa5c3aafaa2bb6d

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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