Update README.md

Update link to distillation process

README.md

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 This model is a distilled version of the [BERT base model](https://huggingface.co/bert-base-cased).
 It was introduced in [this paper](https://arxiv.org/abs/1910.01108).
 The code for the distillation process can be found
-[here](https://github.com/huggingface/transformers/tree/master/examples/distillation).
+[here](https://github.com/huggingface/transformers/tree/main/examples/research_projects/distillation).
 This model is cased: it does make a difference between english and English.
 
 All the training details on the pre-training, the uses, limitations and potential biases (included below) are the same as for [DistilBERT-base-uncased](https://huggingface.co/distilbert-base-uncased).