fix: update README [skip ci]

Author: andrinoff

README.md

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 # Email CLI 🦫
 
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 <img src = "assets/logo.png" width=200 height=200>
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 ![Main Menu Screenshot](assets/preview.png)
 
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 ## Features ✨
 
 - **View Your Inbox**: Fetches and displays a list of your most recent emails.