error when loading model with newer version of transformers

[chrisrude]

https://github.com/huggingface/transformers/blob/1689aea73346816b936b84932e12b774974e61a6/src/transformers/utils/logging.py#L291
The transformer package now monkey-patches the global Logger object, which gets undone when we initialize our own logging. Do a quick fix to at least let their specific attributes continue to work.

When this error occurs, you would see this when trying to load a model into Oobabooga, only when oobabot-plugin is loaded:

line 135, in init logger.warning_once( AttributeError: ‘Logger’ object has no attribute ‘warning_once’

[chrisrude]

fixed in 84017e7

Going to push 0.2.2 soon to distribute the fix, as it's a severe regression.