Update the Colab of open-domain VQA

Author: yangapku

colab.md

@@ -6,4 +6,4 @@ We provide Colab notebooks of different downstream tasks for you guys to enjoy O
 * [Generic Interface](https://colab.research.google.com/drive/1jogyZ-2rdHU3XxZOf3TBfhex1XHqX-1m?usp=sharing#scrollTo=s9Vni6YUZOpC) (using different instructions to perform various tasks with just one model.)
 * [Image Captioning](https://colab.research.google.com/drive/1Q4eNhhhLcgOP4hHqwZwU1ijOlabgve1W?usp=sharing)
 * [Referring Expression Comprehension](https://colab.research.google.com/drive/1AHQNRdaUpRTgr3XySHSlba8aXwBAjwPB?usp=sharing)
-* [Open-Domain Visual Question Answering](https://colab.research.google.com/drive/1yk9wq7-B9CyoheJyeG5J_UP6eCXQ3hJG?usp=sharing)
+* [Open-Domain Visual Question Answering](https://colab.research.google.com/drive/1lsMsF-Vum3MVyXwSVF5E-Y23rHFvj_3y?usp=sharing)