readme: DPR query encoder for Biomedical slot filling see https://arxiv.org/abs/2109.08564 for details.
  
  Load with:
  
  ```python
  from transformers import DPRQuestionEncoder, DPRQuestionEncoderTokenizerFast
  qry_encoder = DPRQuestionEncoder.from_pretrained('healx/biomedical-dpr-qry-encoder')
  qry_tokenizer = DPRQuestionEncoderTokenizer.from_pretrained('facebook/dpr-question_encoder-single-nq-base')
  ```