fix expired link in python onnxruntime readme (#1013)

Meng Wei

2023-10-17 8a16e1c13e91c9a7c43ba546fd71b85765d9469f

1
{"bos_token": "<|endoftext|>", "eos_token": "<|endoftext|>", "unk_token": "<|endoftext|>"}