DistilBertModel support

[AbrJA]

Hi there,

First of all, thanks for the wonderful package you have done.

I'm trying to load a HuggingFace Model but I got these warnings and an error:

using Transformers
using Transformers.TextEncoders
using Transformers.HuggingFace

textenc, model = hgf"sentence-transformers/distiluse-base-multilingual-cased-v1"

┌ Warning: startsym <s> not in vocabulary, this might cause problem.
└ @ Transformers.TextEncoders [/home/ajaimes/.julia/packages/Transformers/lD5nW/src/textencoders/bert_textencoder.jl:77](https://file+.vscode-resource.vscode-cdn.net/home/ajaimes/.julia/packages/Transformers/lD5nW/src/textencoders/bert_textencoder.jl:77)

┌ Warning: endsym </s> not in vocabulary, this might cause problem.
└ @ Transformers.TextEncoders [/home/ajaimes/.julia/packages/Transformers/lD5nW/src/textencoders/bert_textencoder.jl:78](https://file+.vscode-resource.vscode-cdn.net/home/ajaimes/.julia/packages/Transformers/lD5nW/src/textencoders/bert_textencoder.jl:78)

Unknown model type: distilbert

Do you have in mind adding support for this type of models (distilbert)? Or is there some way to achieve this?

Thank you in advance!