Fix the link of requirements.txt

The link of the requirements.txt was not accessible, so changed it with https://github.com/AkariAsai/self-rag/blob/main/requirementd.txt. It works with this link.

README.md

@@ -8,7 +8,7 @@ At inference, we leverage reflection tokens covering diverse aspects of generati
 See full descriptions in See full descriptions in [our paper](hhttps://arxiv.org/abs/2310.11511). 
 
 ## Usage
-Here, we show an easy way to quickly download our model from HuggingFace and run with `vllm` with pre-given passages. Make sure to install dependencies listed at [self-rag/requirements.txt](https://github.com/AkariAsai/self-rag/requirements.txt). 
+Here, we show an easy way to quickly download our model from HuggingFace and run with `vllm` with pre-given passages. Make sure to install dependencies listed at [self-rag/requirements.txt](https://github.com/AkariAsai/self-rag/blob/main/requirementd.txt). 
 To run our full inference pipeline with a retrieval system and fine-grained tree decoding, please use [our code](https://github.com/AkariAsai/self-rag). 
 
 ```py