Modifying Vocab file not supported while finetuning

[riddhikt]

I was trying to fine tune the model with custom words but the output was incorrect, I tried to traverse the code and found this:

https://github.com/neuspell/neuspell/blob/aa3782c2ea25d286b487ead3d99389dfc6801907/neuspell/corrector_subwordbert.py#L81

So currently it doesn't support modifying the vocab file, please let me know if there is a other way round.