Update README.md

README.md

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 # If you are a Mac user, the following free wonderful AI tools can help you to read and understand PDFs effectively:
 - If you are using Zotero for managing and reading your personal PDFs, [PapersGPT](https://www.papersgpt.com) is a free plugin which can assist you to chat PDFs effectively by your local phi-3.5-mini.
-- you can download the beautiful ChatPDFLocal MacOS app from [here](https://www.chatpdflocal.com), load one or batch PDF files at will, and quickly experience the effect of the model through chat reading. PS. Click [here](https://awa-ai.lemonsqueezy.com/buy/89be07f8-060d-4a8f-a758-f25352773168) to subscribe or invite friends in ChatPDFLocal MacOS app can earn credits to use freely.
+- you can download the beautiful ChatPDFLocal MacOS app from [here](https://www.chatpdflocal.com), load one or batch PDF files at will, and quickly experience the effect of the model through chat reading.