update model card README.md

Merge branch 'main' of https://huggingface.co/gerardozq/biobert_v1.1_pubmed-finetuned-squad into main

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Update README.md

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Training in progress, step 500

Training in progress, step 500

Training in progress, step 500

update model card README.md

End of training

Training in progress, step 500

initial commit