Is your feature request related to a problem? Please describe.
My model nlp file is growing quite large over time.

Describe the solution you'd like
Would be great to compress it.

Describe alternatives you've considered
Yeah I can and probably will do this manually with the import and export features.

But could be a good feature to have?
Just thought I would open this to ask if anyone has considered a way to do this in the NLPManager?
Or perhaps there is a way to do this already built-in that I am not aware of, did look and couldn't seem to find one in docs.

Perhaps an option of compressed defaulting to false.

https://github.com/axa-group/nlp.js/blob/master/docs/v3/nlp-manager.md#importexport-using-json