How can i change default vocabs for world model?

[xiaol]

need some change for default vocabs file

like this one, add some new special tokens in the end of file:

https://huggingface.co/xiaol/RWKV-paper-reviewer-and-reading-comprehension-wenda-Worldv4-7B-16k/blob/main/rwkv_vocab_v20230424.txt