Update README.md (#374)

Author: isafulf

README.md

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 # ChatGPT Retrieval Plugin
 
-> **Join the [ChatGPT plugins waitlist here](https://openai.com/waitlist/plugins)!**
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 Find an example video of a Retrieval Plugin that has access to the UN Annual Reports from 2018 to 2022 [here](https://cdn.openai.com/chat-plugins/retrieval-gh-repo-readme/Retrieval-Final.mp4).
 
 ## Introduction