Update README.md

README.md

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 # PG-InstructBLIP model
 
-Finetuned version of InstructBLIP with Flan-T5-XXL as the language model. PG-InstructBLIP was introduced in the paper [Physically Grounded Vision-Language Models for Robotic Manipulation](https://iliad.stanford.edu/pg-vlm/) by Gao et al.
+Finetuned version of InstructBLIP with Flan-T5-XXL as the language model. PG-InstructBLIP was introduced in the paper [Physically Grounded Vision-Language Models for Robotic Manipulation](https://iliad.stanford.edu/pg-vlm/) by Gao et al ([arxiv](arxiv.org/abs/2309.02561)).
 
 ## Model description