Fix broken link in opening section (#3)

- Fix broken link in opening section (f8354bcfbd3068faf2c5149654881cb4214e931d)


Co-authored-by: Marissa Gerchick <[email protected]>

README.md

@@ -12,7 +12,7 @@ datasets:
 
 This model is a distilled version of the [BERT base model](https://huggingface.co/bert-base-uncased). 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). This model is uncased: it does
+[here](https://github.com/huggingface/transformers/tree/main/examples/research_projects/distillation). This model is uncased: it does
 not make a difference between english and English.
 
 ## Model description